Question

What number do we need to divide `2` by to get `90` as our solution?

Answer 1

Let say that `a` is the number we are looking then

`2/a=90`

Hence

`a*2/a=a*90`

`2=90*a`

`a=2/90`

So we verify that our result is the correct one

`2/(2/90)=(90*2)/2=90`

Answer 2

Call the number we want to find '`x`', then:

`2/x=90`

Multiply both sides by `x`, then divide both sides by `90`, and we have:

`x=2/90=1/45~=0.0222`