Justin bought a total of 14 sweets and mochi balls. Each sweet cost 50¢. Each mochi ball cost 60¢. He paid a total of $7.90. How many mochi balls did he buy?
Number of
sweets |
Amount paid
for the sweets |
Number of
mochi balls |
Amount paid
for the sweets |
Total paid |
| 14 |
14 x 50
= 700¢ |
0 |
0 |
700¢ |
| 13 |
13 x 50
= 650¢ |
1 |
1 x 60
= 60¢ |
710¢ |
| 5 |
5 x 50
= 250¢ |
9 |
9 x 60
= 540¢ |
790¢ |
$1 = 100¢
$7.90 = 790¢
Amount paid if all were sweets
= 14 x 50
= 700¢
Big difference between the amount paid for the sweets and the mochi balls
= 790 - 700
= 90¢
Small difference between the amount paid for the one sweet and one mochi ball
= 60 - 50
= 10¢
Number of mochi balls
= 90 ÷ 10
= 9
Answer(s): 9
