Exams › SSC CGL (Prelims) › General

Three numbers are in the ratio 3:5:7. If their average is 60, what is the difference between the largest and the smallest number?

1. 36
2. 42
3. 48
4. 54

Correct answer: 48

Solution

If the numbers are 3x, 5x, and 7x, their average is 5x. Since the average is 60, x = 12. The difference between the largest and smallest is 7x - 3x = 4x = 48.

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