Question 592096
The first step is to simplify the numerator: 8/15 - 5/12
You do that by finding the LCD of 15 and 12 which is 60. Then you make each fraction has the same denominator of 60 and subtract the numerator.
8/15 - 5/12 = 32/60 - 25/60 = 7/60
Next you will divide 7/60 by 1/20 . You do that by multiplying 7/60 by 20
(7/60) * (20) = 7/3

Hope it helps you:)
John10