Mathematics for IGCSE & O level - Ratio And Proportion (Section 6 - No. 39)
If the ratio of two numbers is 7:9, and the difference between the numbers is 12, what are the two numbers?
14, 16
21, 27
28, 36
35, 45
Giải thích
Ratio suggests the difference corresponds to 2 parts. Thus, two parts = 12, hence each part is 6. So 7 parts = 42 and 9 parts= 54. However, the question is wrong. The answer needs to be 42 and 54. So none of the given options are correct.