Question

A bookstore had 98 copies of a magazine. Yesterday, it sold 2/7 of them. Today, it sold 3/7 of what remained. How many copies does the bookstore have left?

Answer 1

30

Explanation:

After the first day there were 5/7 of the original number remaining: 70

After the 2nd day there were 3/7 remaining from the number the 2nd day started with (which is the same number as we ended with AFTER the first day): 70*3/7 = 30

Or, we can combine everything into one calculation: