Question

Someone help me on this.

Answer 1

`(f)/(5)=(f+3)/(20)` Cross multiply. (multiply 5 on both sides, and multiply 20 on both sides)

(20)f = 5(f + 3) Multiply 5 into (f + 3)

20f = 5f + 15 Subtract 5f on both sides

15f = 15 Divide 15 on both sides to get "f" by itself

f = 1