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One-eighth of a bookstore’s magazines are sold on a Friday. If 1/4 of the remaining magazines are sold the next day, what fractional part of the magazines remains at the end of the second day?

A 21/32

At the end of the first day, there are 1-1/8 =7/8 of the magazines remaining.
7/8 * 1/4 = 7/32 sold the next day. So at the end of the second day, there are 7/8 - 7/32 =28/32-7/32=21/32 of the magazines remaining.