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

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

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Let the number be x. 

Then, 4*x/5 –(65% of x) = 21 

4x/5 –65x/100 = 21 

5x = 2100 

x = 140.

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