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Anonymous
35.
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5/8 - 7/20 = 25/40 - 14/40 = 11/40
7/10 - 5/8 = 28/40 - 25/40 = 3/40
(7/8) - (3/5) = (35/40) - (24/40) = 11/40 = 0.275
7 over 40
2\5-7\8= -19\40