Valen bought a total of 21 sweets and chocolate bars. Each sweet cost 40¢. Each chocolate bar cost 50¢. He paid a total of $9.10. 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 |
| 21 |
21 x 40
= 840¢ |
0 |
0 |
840¢ |
| 20 |
20 x 40
= 800¢ |
1 |
1 x 50
= 50¢ |
850¢ |
| 14 |
14 x 40
= 560¢ |
7 |
7 x 50
= 350¢ |
910¢ |
$1 = 100¢
$9.10 = 910¢
Amount paid if all were sweets
= 21 x 40
= 840¢
Big difference between the amount paid for the sweets and the chocolate bars
= 910 - 840
= 70¢
Small difference between the amount paid for the one sweet and one chocolate bar
= 50 - 40
= 10¢
Number of chocolate bars
= 70 ÷ 10
= 7
Answer(s): 7
