Mathematics for IGCSE & O level - Ratio And Proportion (Section 6 - No. 18)
If the ratio of two quantities is 3:5, and the smaller quantity is 12, what is the larger quantity?
15
20
25
30
Erläuterung
If 3 corresponds to 12, then each part of the ratio represents 4. Therefore, the larger quantity (5 parts) is 5 * 4 = 20.