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

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

A 140

B 142

C 144

D 145

Solution

Correct Answer: Option A

Let the number be x.

Then, 4 × x/5 –(65% of x) = 21

4x/5 –65x/100 = 21