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Mathematics for IGCSE & O level - Ratio And Proportion (Section 3 - No. 13)

The ratio of boys to girls in a class is 2:5. If there are 14 girls in the class, how many students are there in total?
4
7
20
21

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2:5. 14=5*2, 2*2=4. 14+4 =21

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