{
  "paper": {
    "school": "Rosyth",
    "year": 2025,
    "level": "P3",
    "label": "Weighted Assessment 3",
    "source_prefix": "Rosyth 2025 P3 Weighted Assessment 3",
    "has_answer_key": true
  },
  "questions": [
    {
      "n": 1,
      "type_id": 1,
      "question": "In the figure, how many of the marked angles are obtuse angles?",
      "answer0": "1",
      "answer1": "2",
      "answer2": "3",
      "answer3": "4",
      "correct_answer": 1,
      "skill_id": 99,
      "difficulty_id": 2,
      "explanation": "An obtuse angle is greater than a right angle (90 degrees) but less than a straight angle (180 degrees). Examining the five marked angles of the figure, 2 of them open wider than a right angle. Answer: 2.",
      "hints": ["A right angle is exactly 90 degrees; an obtuse angle is wider than that.", "Compare each marked angle against the corner of a piece of paper to judge if it is wider than 90 degrees."],
      "source": "Rosyth 2025 P3 Weighted Assessment 3 Q1",
      "image_needed": true,
      "image_options": false,
      "image_file": "q1.png",
      "image_page": 2,
      "image_bbox": [0.40, 0.24, 0.60, 0.35],
      "image_loc": "small hexagon-like figure with marked angles, centered below the question on page 2",
      "notes": "Key = option 2 (index 1)."
    },
    {
      "n": 2,
      "type_id": 1,
      "question": "Which of the following fractions is the smallest?",
      "answer0": "1/4",
      "answer1": "1/5",
      "answer2": "1/10",
      "answer3": "1/7",
      "correct_answer": 2,
      "skill_id": 79,
      "difficulty_id": 1,
      "explanation": "For unit fractions (numerator 1), the larger the denominator, the smaller the fraction. Among 1/4, 1/5, 1/10 and 1/7, the largest denominator is 10, so 1/10 is the smallest. Answer: 1/10.",
      "hints": ["These are all unit fractions (numerator 1).", "The bigger the denominator, the smaller the unit fraction."],
      "source": "Rosyth 2025 P3 Weighted Assessment 3 Q2",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key = option 3 (index 2)."
    },
    {
      "n": 3,
      "type_id": 1,
      "question": "Find the value of 1/12 + 1/3.",
      "answer0": "1/36",
      "answer1": "2/12",
      "answer2": "2/15",
      "answer3": "5/12",
      "correct_answer": 3,
      "skill_id": 81,
      "difficulty_id": 2,
      "explanation": "Make the denominators the same. 1/3 = 4/12. Then 1/12 + 4/12 = 5/12. Answer: 5/12.",
      "hints": ["Convert 1/3 to twelfths: 1/3 = 4/12.", "Add the numerators over the common denominator 12."],
      "source": "Rosyth 2025 P3 Weighted Assessment 3 Q3",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key = option 4 (index 3)."
    },
    {
      "n": 4,
      "type_id": 1,
      "question": "What is the mass of the box?",
      "answer0": "230 g",
      "answer1": "2230 g",
      "answer2": "2300 g",
      "answer3": "2600 g",
      "correct_answer": 3,
      "skill_id": 85,
      "difficulty_id": 2,
      "explanation": "The scale is marked in kg from 0 to 8. Each numbered interval (2 kg) is split into smaller divisions. The pointer reads 2.6 kg, which is 2600 g. Answer: 2600 g.",
      "hints": ["The dial is in kilograms; read where the needle points then convert to grams.", "1 kg = 1000 g."],
      "source": "Rosyth 2025 P3 Weighted Assessment 3 Q4",
      "image_needed": true,
      "image_options": false,
      "image_file": "q4.png",
      "image_page": 3,
      "image_bbox": [0.38, 0.45, 0.66, 0.70],
      "image_loc": "kitchen weighing scale with a box on top, centered below the question on page 3",
      "notes": "Key = option 4 (index 3), i.e. 2600 g."
    },
    {
      "n": 5,
      "type_id": 1,
      "question": "What is the value of A?",
      "answer0": "3/12",
      "answer1": "8/12",
      "answer2": "1/3",
      "answer3": "3/4",
      "correct_answer": 3,
      "skill_id": 66,
      "difficulty_id": 2,
      "explanation": "The number line from 0 to 1 is divided into 12 equal parts (markings at 2/12, 5/12 are shown). A sits at the 9th mark, i.e. 9/12, which simplifies to 3/4. Answer: 3/4.",
      "hints": ["Count the equal intervals between 0 and 1 to find what each tick is worth.", "9/12 can be simplified by dividing top and bottom by 3."],
      "source": "Rosyth 2025 P3 Weighted Assessment 3 Q5",
      "image_needed": true,
      "image_options": false,
      "image_file": "q5.png",
      "image_page": 4,
      "image_bbox": [0.22, 0.15, 0.82, 0.23],
      "image_loc": "horizontal number line from 0 to 1 with point A marked, near top of page 4 below the question",
      "notes": "Key = option 4 (index 3); 9/12 = 3/4."
    },
    {
      "n": 6,
      "type_id": 1,
      "question": "Mr Lim walked from his house to point A and another 600 m to reach his office. Going home, he took another route walking 3100 m from his office to his home. How much longer was the route going home?",
      "answer0": "400 m",
      "answer1": "1000 m",
      "answer2": "2700 m",
      "answer3": "5890 m",
      "correct_answer": 0,
      "skill_id": 87,
      "difficulty_id": 2,
      "explanation": "Route to office: 2100 m + 600 m = 2700 m. Route going home: 3100 m. Difference: 3100 - 2700 = 400 m longer. Answer: 400 m.",
      "hints": ["First find the total distance of the route to the office (house to A plus A to office).", "Subtract that total from the 3100 m route taken going home."],
      "source": "Rosyth 2025 P3 Weighted Assessment 3 Q6",
      "image_needed": true,
      "image_options": false,
      "image_file": "q6.png",
      "image_page": 4,
      "image_bbox": [0.18, 0.58, 0.82, 0.74],
      "image_loc": "route diagram showing house, Point A and office with distances 2100 m, 600 m, 3100 m, lower half of page 4",
      "notes": "Key = option 1 (index 0); 3100 - 2700 = 400 m."
    },
    {
      "n": 7,
      "type_id": 2,
      "question": "Study the figure. How many angles in the figure are smaller than a right angle? [?]",
      "answer0": "3",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 99,
      "difficulty_id": 2,
      "explanation": "An angle smaller than a right angle is an acute angle (less than 90 degrees). Counting the marked angles in the figure that are narrower than a right angle gives 3. Answer: 3.",
      "hints": ["An angle smaller than a right angle is called an acute angle.", "Use the corner of a page as a 90-degree reference and count the angles narrower than it."],
      "source": "Rosyth 2025 P3 Weighted Assessment 3 Q7",
      "image_needed": true,
      "image_options": false,
      "image_file": "q7.png",
      "image_page": 5,
      "image_bbox": [0.26, 0.24, 0.80, 0.45],
      "image_loc": "square-grid figure with several marked angles, below the question in Section B on page 5",
      "notes": "Key = 3."
    },
    {
      "n": 8,
      "type_id": 0,
      "question": "Draw a line perpendicular to AB, passing through point X.",
      "answer0": null,
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 100,
      "difficulty_id": 2,
      "explanation": "Draw a straight line through X that meets AB at a right angle (90 degrees). On the square grid, the perpendicular runs at right angles to the slope of AB through point X.",
      "hints": ["Perpendicular lines cross at a right angle (90 degrees).", "The new line must pass exactly through point X."],
      "source": "Rosyth 2025 P3 Weighted Assessment 3 Q8",
      "image_needed": true,
      "image_options": false,
      "image_file": "q8.png",
      "image_page": 5,
      "image_bbox": [0.24, 0.55, 0.78, 0.82],
      "image_loc": "square grid with slanted line AB and point X, lower half of page 5",
      "notes": "Interactive draw task (no app question type) -> type_id 0, skipped on insert. Answer key: line drawn through X perpendicular to AB."
    },
    {
      "n": 9,
      "type_id": 2,
      "question": "Study the figure in the square grid. (a) Name a pair of parallel lines. (b) Name a pair of perpendicular lines. [?] // [?] ; [?] perpendicular to [?]",
      "answer0": "AB",
      "answer1": "ED",
      "answer2": "AB",
      "answer3": "AF",
      "correct_answer": null,
      "skill_id": 100,
      "difficulty_id": 2,
      "explanation": "Parallel lines never meet and run in the same direction: AB is parallel to ED. Perpendicular lines meet at a right angle: AB is perpendicular to AF. Answers: (a) AB // ED, (b) AB perpendicular to AF.",
      "hints": ["Parallel lines stay the same distance apart and never cross.", "Perpendicular lines meet at a 90-degree corner."],
      "source": "Rosyth 2025 P3 Weighted Assessment 3 Q9",
      "image_needed": true,
      "image_options": false,
      "image_file": "q9.png",
      "image_page": 6,
      "image_bbox": [0.24, 0.14, 0.72, 0.34],
      "image_loc": "square-grid figure with labelled points A, B, C, D, E, F, top of page 6",
      "notes": "Key: a) AB // ED  b) AB perpendicular to AF. Word/letter answers but exact short labels; kept as FIB blanks in order a-pair then b-pair. Other valid parallel/perpendicular pairs may exist; grader expects these labels."
    },
    {
      "n": 10,
      "type_id": 2,
      "question": "Arrange the following fractions from the greatest to the smallest.\n5/11 , 1/2 , 3/5\n[?] , [?] , [?]\n(greatest)",
      "answer0": "3/5",
      "answer1": "1/2",
      "answer2": "5/11",
      "answer3": null,
      "correct_answer": null,
      "skill_id": 79,
      "difficulty_id": 2,
      "explanation": "Compare each to 1/2. 3/5 = 0.6 (greater than 1/2). 1/2 = 0.5. 5/11 is just under 0.5 (5.5/11 would be 1/2). So greatest to smallest: 3/5, 1/2, 5/11.",
      "hints": ["Compare each fraction with 1/2 as a benchmark.", "5/11 is a little less than 5.5/11, and 5.5/11 = 1/2."],
      "source": "Rosyth 2025 P3 Weighted Assessment 3 Q10",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key (greatest to smallest): 3/5, 1/2, 5/11."
    },
    {
      "n": 11,
      "type_id": 2,
      "question": "A ladder has steps which are equally spaced. Only the first step of the ladder is 20 cm above ground. Find the height of the box. [?]",
      "answer0": "110",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 87,
      "difficulty_id": 3,
      "explanation": "From the first step (20 cm above ground) to the top of the ladder is 135 cm. The box top lines up with a step. Per the answer key the box height is 90 cm + 20 cm = 110 cm. Answer: 110 cm.",
      "hints": ["The first step is 20 cm above the ground; the steps above it are equally spaced.", "Add the height up to the step level that matches the box top to the 20 cm base."],
      "source": "Rosyth 2025 P3 Weighted Assessment 3 Q11",
      "image_needed": true,
      "image_options": false,
      "image_file": "q11.png",
      "image_page": 7,
      "image_bbox": [0.26, 0.22, 0.70, 0.46],
      "image_loc": "ladder beside a box with 135 cm and 20 cm measurements marked, upper-middle of page 7",
      "notes": "Key working: 90 cm + 20 cm = 110 cm. Answer in cm; unit stripped from blank (110)."
    },
    {
      "n": 12,
      "type_id": 2,
      "question": "Ahmad sold 1200 g of mushrooms on Monday. He sold 200 g more of the mushrooms on Tuesday than on Monday.\n(a) What is the mass of mushrooms he sold on both days?\n(b) Ahmad sold some mushrooms on Wednesday. He packed them into 8 smaller bags. The mass of each bag of mushrooms was 300 g. Find the total mass of mushrooms Ahmad sold from Monday to Wednesday.\n(a) [?] g (b) [?] g",
      "answer0": "2600",
      "answer1": "5000",
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 87,
      "difficulty_id": 2,
      "explanation": "(a) Tuesday = 1200 + 200 = 1400 g. Both days = 1200 + 1400 = 2600 g. (b) Wednesday = 300 x 8 = 2400 g. Monday to Wednesday = 2600 + 2400 = 5000 g.",
      "hints": ["Find Tuesday's mass first (200 g more than Monday), then add Monday and Tuesday.", "Wednesday's total is 8 bags of 300 g each; add it to the two-day total."],
      "source": "Rosyth 2025 P3 Weighted Assessment 3 Q12",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: a) 2600 g  b) 5000 g. Multi-part combined into one FIB with 2 blanks (a then b)."
    },
    {
      "n": 13,
      "type_id": 2,
      "question": "Aini baked 104 chocolate muffins and 128 blueberry muffins. She packed the muffins in bags of 6.\n(a) How many bags of muffins did she pack at most?\n(b) Aini sold each bag of muffins for $9. How much money did she receive if she sold all the bags of muffins?\n(a) [?] (b) $[?]",
      "answer0": "38",
      "answer1": "342",
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 76,
      "difficulty_id": 2,
      "explanation": "(a) Total muffins = 104 + 128 = 232. Bags = 232 / 6 = 38 remainder 4, so at most 38 full bags. (b) 38 x $9 = $342.",
      "hints": ["Add both kinds of muffins, then divide by 6; the remainder is not a full bag.", "Multiply the number of full bags by $9."],
      "source": "Rosyth 2025 P3 Weighted Assessment 3 Q13",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: a) 38 bags (232 / 6 = 38 R4)  b) $342. Two blanks (a then b)."
    },
    {
      "n": 14,
      "type_id": 2,
      "question": "Ali has 300 stamps. Bernard has 40 less stamps than Ali. Chandra has 4 times as many stamps as Bernard.\n(a) How many more stamps does Chandra have than Bernard?\n(b) What is the total number of stamps the children have?\n(a) [?] (b) [?]",
      "answer0": "780",
      "answer1": "1600",
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 76,
      "difficulty_id": 2,
      "explanation": "Bernard = 300 - 40 = 260. Chandra = 260 x 4 = 1040. (a) Chandra - Bernard = 1040 - 260 = 780 more. (b) Total = 300 + 260 + 1040 = 1600.",
      "hints": ["Work out Bernard first (40 less than Ali), then Chandra (4 times Bernard).", "For the total, add all three children's stamps."],
      "source": "Rosyth 2025 P3 Weighted Assessment 3 Q14",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "notes": "Key: a) 780  b) 1600. Two blanks (a then b)."
    }
  ]
}