Question

A bookstore had 80 copies of a magazine. Yesterday, it sold 1/4 of them. Today, it sold 3/5 of what remained. How many copies does the bookstore have left?

Answer 1

what is one fourth of 80?

Answer 2

which is another way of asking
what is \(80\div 4\)?

Answer 3

20?

Answer 4

yes
so they started with 80. sold 20, how many are left ?

Answer 5

60?

Answer 6

yes

Answer 7

then they sell 3/5 of those
what is three fifths of 60?
or
what is \[60\times \frac{3}{5}\]?

Answer 8

36?

Answer 9

yes
so they had 60, sold 36
how many are left?

Answer 10

24?

Answer 11

yes