Mathematics for IGCSE & O level - Ratio And Proportion (Section 3 - No. 25)
Two numbers are in the ratio 3:7. The sum of the numbers is 60. What is the smaller number?
9
18
21
30
Explanation
3 + 7 = 10. Then, 60/10 = 6. Then, 3 * 6 = 18.
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