Exams › SSC CGL (Prelims) › General

If 14 : 30 :: 7 : x, what is the value of x?

1. 15
2. 21
3. 9
4. 12

Correct answer: 15

Solution

In the proportion 14 : 30 :: 7 : x, we have 14/30 = 7/x. Cross-multiplying gives 14x = 210, so x = 15. The ratio is halved when the first term goes from 14 to 7, so the second term also halves from 30 to 15.

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