Question

Can you help me on this?

Answer 1

y = 30

Explanation:

We can use ratio's to solve this

40 20

----- = -----------

100 20 + y

Using cross products

40 * (20+y) = 20*100

Distribute

800 + 40y = 2000

Subtract 800 from each side

40y = 2000-800

40y = 1200

Divide by 40

y = 1200/40

y =30