Question

Twenty-five decreased by one fifth of a number is 18. Find the number.

Answer 1

Answer:

35

Step-by-step explanation:

You have to work backwards, you find what 25-18 is (7)

7 is a fifth of the number you are looking for

so all you have to do is 7 x 5 and you get 35

Answer 2

Answer:

35

Step-by-step explanation:

We have the following equation that represents the problem:

$25 - \frac{1}{5}x = 18$, where x is the answer we are looking for.

We can subtract both sides by 18:

$25 - 18 - \frac{1}{5}x = 0$

$7 - \frac{1}{5}x = 0$

add $\frac{1}{5}x$ to both sides:

$7 = \frac{1}{5}x$

multiply both sides by 5:

$35 = x$.

Here, x = 35