Michelle is a baker. to make 6 pies she uses
7 1/2 cups of flour. how many cups of flour is needed to make 1 pie?

If she uses 7.5 cups of flowers for 6 pies, then you need to find the "ratio". So first you need to divide 6 from 7.5, and that gets you 1.25. So that means that for one pie she uses 1.25 cups of flour!

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Is always easier to subtract or add fractions with the same denominator, so
6 2/5 is the same as 6  8/20 
I would suggest turning them both to improper fractions, 
(You multiply 6 by the denominator 20 and get 120 then add 8)
6 8/20 = 128/20 
and then do the same with 7 17/20  (Mutiply 7 and 20 and then add 17)
7 17/20 = 157/20

157/20 - 128/20 = 29/20 or 1 9/20