Question

if one fifths of a number decreased by 5 is 16 find the number

Answer 1

The answer is 105.
Let the number be x.
1\5x-5=16.
1\5x=16+5.
1\5x=21.
x=21*5.
x=105.

Answer 2

Let the number be x
one fifth of the number = $\frac{x}{5}$
One fifth of a number decreased by 5 is equal to 16
$\frac{x}{5} - 5 = 16$
$\frac{x}{5} = 21$
⇒ x = 105
The number is 105