4MA1/1F Jun 2018, Question 13: Dividing in a Given Ratio
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1F (Foundation) · Calculator · 5 marks
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The question, in short
Cinema has children and adults; 3/5 are children, girls to boys is 2:7, and 170 girls. Work out the number of adults.
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Solution · 5 marks
- 1170 girls are 2 parts, so 1 part = 170 ÷ 2 = 85
- 2Children are 2 + 7 = 9 parts = 85 × 9 = 765
- 3Children are 3/5 of the people, so 1/5 = 765 ÷ 3 = 255
- 4Adults are 2/5 = 255 × 2 = 510
Answer510
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