When a number is decreased by 20% of itself, the result is 136. what is the number?

The number is 170

Step-by-step explanation:

Let's solve for x, this way:

x = A number that decreased by 20% of itself, the result is 136

20% = 0.2

x - 0.2x = 136 (Like terms)

0.8x = 136

x = 136/0.8 (Dividing by 0.8 at both sides)

x = 170

Let's prove that x = 170 is correct

170 - 0.2 (170) = 136

170 - 34 = 136

136 = 136

We proved that x = 170 is correct