{"question":"1 watermelon and 4 similar apples weighed 4.05 kg.<br>1 such watermelon and 1 such apple weighed 3.45 kg.<br>(a) What was the mass of 1 such apple? (b) What was the mass of 1 such watermelon? <input type=\"text\" id=\"input_0\" class=\"fill-blank-input\" placeholder=\"?\" \/>","answer0":"0.2 kg","answer1":"3.25 kg","answer2":null,"explanation":"(a) Subtracting the two: (1 watermelon + 4 apples) - (1 watermelon + 1 apple) = 3 apples = 4.05 - 3.45 = 0.60 kg, so 1 apple = 0.60 \/ 3 = 0.2 kg.<br>(b) 1 watermelon = 3.45 - 1 apple = 3.45 - 0.2 = 3.25 kg."}