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Question

A student was asked to multiply a given number by 4/5 . By mistake, he divided the given number by 4/5. His answer was 36 more than the correct answer. What was the given number ?

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Solution

Let the no be x.

Difference=36

(5x/4 - 4x/5)=36

(25x-16x)/20=36

x=(20*36)/9

x=80

Difference=36

(5x/4 - 4x/5)=36

(25x-16x)/20=36

x=(20*36)/9

x=80

9

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