how many bars were eaten during the party?

Question

Mr Abbot buys 8 boxes of granola bars for a party. Each box has 9 granola bars. After the party, there are 39 bars left.

Answer 1

Since each box has 9 bars and there are 8 boxes, you have a total of

 

8 x 9 = 72 granola bars

 

Total bars eaten is

72 - 39 = 33

 

33 granola bars were eaten during the party.