George bought a total of 15 mini cupcakes and mochi balls. Each mini cupcake cost 50¢. Each mochi ball cost 60¢. He paid a total of $8.20. How many mochi balls did he buy?
Number of
mini cupcakes |
Amount paid
for the mini cupcakes |
Number of
mochi balls |
Amount paid
for the mini cupcakes |
Total paid |
| 15 |
15 x 50
= 750¢ |
0 |
0 |
750¢ |
| 14 |
14 x 50
= 700¢ |
1 |
1 x 60
= 60¢ |
760¢ |
| 8 |
8 x 50
= 400¢ |
7 |
7 x 60
= 420¢ |
820¢ |
$1 = 100¢
$8.20 = 820¢
Amount paid if all were mini cupcakes
= 15 x 50
= 750¢
Big difference between the amount paid for the mini cupcakes and the mochi balls
= 820 - 750
= 70¢
Small difference between the amount paid for the one mini cupcake and one mochi ball
= 60 - 50
= 10¢
Number of mochi balls
= 70 ÷ 10
= 7
Answer(s): 7
