The answer is 21.
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7 8ths = 7/8 = 0.875
The answer is 7/8 minus 5/6 = 1/24
5/24 + 3/8 = 7/12 or seven twelfths.
1&7/24ths 24 is the common denominator for 2/3rds & 5/8ths. 2/3rds=16/24ths & 5/8ths = 15/24ths
140