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Sixty five percent of a number is 21 less than four fifth of that number. What is the number ?

A. 123

B. 140

C. 156

D. 234

Correct Answer :

B. 140


Let the number be x.


Then, 4*x/5 –(65% of x) = 21


4x/5 –65x/100 = 21


5 x = 2100


x = 140.

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