Use the top-level ratio 7:3 to find how many English and Chinese there are, then break each group down using sub-ratios.
[[model:questions/solutions/q10486.png]]
• Top-level ratio 7:3 means 10 units in total.
• 100 ÷ 10 = 10 per unit.
• English: 7 × 10 = 70
• Chinese: 3 × 10 = 30
For the English (sub-ratio 4 + 3):
• 7 parts = 10 per part
• fiction: 4 × 10 = 40
• non-fiction: 3 × 10 = 30
For the Chinese (sub-ratio 2 + 1):
• 3 parts = 10 per part
• fiction: 2 × 10 = 20
• non-fiction: 1 × 10 = 10
Total fiction: 40 + 20 = 60.
Check: 70 + 30 = 100 = total (100). ✓
Final Answer: 60