Zane bought a total of 17 chocolate bars and mochi balls. Each chocolate bar cost 40¢. Each mochi ball cost 60¢. He paid a total of $8.20. How many mochi balls did he buy?
Number of
chocolate bars |
Amount paid
for the chocolate bars |
Number of
mochi balls |
Amount paid
for the chocolate bars |
Total paid |
| 17 |
17 x 40
= 680¢ |
0 |
0 |
680¢ |
| 16 |
16 x 40
= 640¢ |
1 |
1 x 60
= 60¢ |
700¢ |
| 10 |
10 x 40
= 400¢ |
7 |
7 x 60
= 420¢ |
820¢ |
$1 = 100¢
$8.20 = 820¢
Amount paid if all were chocolate bars
= 17 x 40
= 680¢
Big difference between the amount paid for the chocolate bars and the mochi balls
= 820 - 680
= 140¢
Small difference between the amount paid for the one chocolate bar and one mochi ball
= 60 - 40
= 20¢
Number of mochi balls
= 140 ÷ 20
= 7
Answer(s): 7
