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Question

Jo's collection contains US, Indian and British stamps. If the ratio of US to Indian stamps is 5:2 and the ratio of Indian to British stamps is 5:1, what is the ratio of US to British stamps?


A

10:3

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B

15:4

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C

25:2

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D

data insufficient

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E

none

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Solution

The correct option is C

25:2


Indian stamps are common to both ratios. Multiply both ratios by factors such that the Indian stamps are represented by the same number.

US : Indian = 5 : 2, and Indian : British = 5 : 1. Multiply the first by 5, and the second by 2.

Now US : Indian = 25 : 10, and Indian : British = 10 : 2

Hence the two ratios can be combined and US : British = 25 : 2.


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