Jo's collection contains US, Indian and British stamps. If the ratio of US to Indian stamps is 5 to 2 and the ratio of Indian to British stamps is 5 to 1, what is the ratio of US to British stamps?
Explanation:
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
the two ratios can be combined and US : British = 25 : 2
Hence, option 4 is the correct answer.
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By: Amit Kumar