8/15 minus 7/20 is 11/60
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Converting to twentieths, we get 8 over 20 minus 15 over 20, resulting in minus 7 over 20.
7/20 − 1/5 = 15/100 which reduces to 3/20
1 and 19/20
43 minus 27 3/7 = 15 4/7
7/15 − 4/9 = 3/135 which reduces to 1/45