Question

Separate 90 into two parts so that one part is four times the other number.

Answer 1

Answer

The first part will be 18

The second part will be 72

Explanation

To separate 90 into two parts so that one part is four times the other number, we shall perform the following:

Let the first part be x

Let the second part be 4x

So,

$\begin{gathered} x+4x=90 \\ \\ 5x=90 \\ \\ x=\frac{90}{5} \\ \\ x=18 \end{gathered}$

Therefore, the first part will be 18 and the second part will be (4 x 18) = 72