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1 and 2/5 minus 7/8 is 21/40. 1 and 2/5 is equivalent to 7/5, giving you 7/5 minus 7/8. Multiply 7/5 by 8/8 to get 56/40, then 7/8 by 5/5 to get 35/40. 56/40 minus 35/40 gives you 21/40.
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