There are two distinct natural numbers. Each is first increased by 10 then by same percentage as each was increased for the first time. Each number finally results in 72 Find the difference between the numbers.

Question

i have received your answer as your faculty posted the answer but in that ans. I didn't understand one step which is given below

How it comes
percentage increase for first time = 10/x that step i didn't get please explain again  

Answer 1

% increase is the amount of increase, divided by the original value.

In this case, the number x is increased by 10.

If 20 is increased by 10, that is a 50% increase, since 10/20 = 0.50

If 40 is increased by 10, that is a 25% increase, since 10/40 = 0.25