Question

What is m when I is 20

Answer 1

l = 20

20 = 12 + 2.5m

2.5m = 20 - 12

2.5m = 8

m = 8 ÷ 2.5

m = 3.2cm

Answer 2

3.2 because l is 20 so you would put your constant on another side and subtract it from 20 leaving you with 8 = 2.5m and then you would just solve for m from there.