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Two numbers X and Y are respectively 20% ad 28% less than a third number Z. By what percentage is the number Y less than the number X

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Two numbers X and Y are respectively 20% ad 28% less than a third number Z. By what percentage is the number Y less than the number X?

(a)

8%

(b)

9%

(c)

10%

(d)

12%

Answer:

(c)

Explanation

Option 1, 8%, is incorrect because it is too close to the difference between the two percentages stated in the initial question (28%-20%) but doesn`t take into account how these percentages relate to each other, not just to Z.