Question

Evaluate `4/x=(2x)/18`, where `x>0`?

Answer 1

`x = 6`

Explanation:

FIrst, set up the ratio:

`4/x = (2x)/18`

Now, cross multiply:

`2x^2 = 72`
`x^2 = 36`
`x = pm sqrt(36)`

Since `x > 0`,
`x = 6`