Oscar bought a total of 20 sweets and chocolate bars. Each sweet cost 40¢. Each chocolate bar cost 70¢. He paid a total of $9.20. How many chocolate bars did he buy?
Number of
sweets |
Amount paid
for the sweets |
Number of
chocolate bars |
Amount paid
for the sweets |
Total paid |
| 20 |
20 x 40
= 800¢ |
0 |
0 |
800¢ |
| 19 |
19 x 40
= 760¢ |
1 |
1 x 70
= 70¢ |
830¢ |
| 16 |
16 x 40
= 640¢ |
4 |
4 x 70
= 280¢ |
920¢ |
$1 = 100¢
$9.20 = 920¢
Amount paid if all were sweets
= 20 x 40
= 800¢
Big difference between the amount paid for the sweets and the chocolate bars
= 920 - 800
= 120¢
Small difference between the amount paid for the one sweet and one chocolate bar
= 70 - 40
= 30¢
Number of chocolate bars
= 120 ÷ 30
= 4
Answer(s): 4
