11/20 - 2/15
= 11x3/20x3 - 2x4/15x4
= 33/60 - 8/60
= (33 - 8)/60
= 25/60
= 25÷5/60÷5
= 5/12
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8/15 minus 7/20 is 11/60
Converting to twentieths, we get 8 over 20 minus 15 over 20, resulting in minus 7 over 20.
3/5 - 3/4 = 12/20 - 15/20 = (12 - 15)/20 = -3/20
11/20 is already in its simplest form
7/20 − 1/5 = 15/100 which reduces to 3/20