65% of a number is 21 less than four-fifth of that number. what is that number?

A. 100
B. 120
C. 140
D. 160Explanation: Let the number be x
then , (4 * x/ 5) – (65% of x) = 21
(4* x/5)-(65x/100) = 21
5x = 2100
x = 140