When a number is decreased by 10% of itself, the result it 135. What is the number?

Answer 1

Let x be the number. The key words "decreased by" means to subtract.

x - (0.10)x = 135

0.9x = 135

x = 135/0.9 = 150



You can check this by:

150 - (0.1)(150) = 150 - 15 = 135