Question

When 80​% of a number is added to the​ number, the result is 216.

Answer 1

I believe that the answer is 120.

Using this formula:


x+0.8x=216 1.8x=216 x=120

Answer 2

The number you are looking for is 120 and you can easily calculate it by solving the following equation with respect to x
$x+0.8 x = 216$