When 40% of a number is added to the number, the result is 168. What is the number?
Let the number be x.
40% of x is 0.40 · x = 0.40x
0.40x + x = 168
0.40x + 1.00x = 168
1.40x = 168
x = 168 / 1.40
x = 120
