Question

2) seperate 90 into two parts (the sum of two numbers is 90)so that one part Cone number) is four times the other part (the other number)

Answer 1

The sum of two parts equal 90.

Also,

one part is 4 times the other part.

Let the normal part be "x", so the 4 times part would be "4x".

Their sum is 90, thus we can write:

`x+4x=90`

Solving for x (a part):

`\begin{gathered} x+4x=90 \\ 5x=90 \\ x=(90)/(5) \\ x=18 \end{gathered}`

The other part is:

90 - 18 = 72

So,

The two parts we separate 90 into are "18 and 72".