3/8 of 40 = 3/8 x 40
= 15
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3 over 8 of 40 is equal to 15. Since 3/8 is equivalent to 0.375, multiplying 0.375 by 40 gives us 15.
4/5 - 3/8 = 32/40 - 15/40 = 17/40
5/8-3/10 = 25/40 - 12/40 = 13/40
3/5 is the same as 24/40. 3/8 is the same as 15/40. Add them together and you get 39/40.
(7/8) - (3/5) = (35/40) - (24/40) = 11/40 = 0.275