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A Bookstore had 70 copies of a magazine. Yesterday, it sold 2/5 of them.
Today, it sold 5/7 of what remained. How many copies does the bookstore have left?
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Step 1: determine how many left yesterday
70 - = 70 - 28 = 42.
Step 2: determine how many left today
42 - = 42 - 30 = 12.
ANSWER. 12 magazines left.
Solved.