Class S, T and U were given some sweets to sell for their donation drive. The average number of sweets the 3 classes had at first was 226. After Class T sold twice as many sweets as Class S and Class U sold
56 as many sweets as Class T, the average number of sweets the 3 classes had left was 44. How many sweets did Class S and Class U sell altogether?
Class S |
Class T |
Class U |
1x3 |
2x3 |
|
|
6x1 |
5x1 |
3 u |
6 u |
5 u |
Class S : Class T : Class U
3 : 6 : 5
Total number of sweets that the 3 classes had at first
= 3 x 226
= 678
Number of sweets that the 3 classes left
= 3 x 44
= 132
Number of sweets that were sold by 3 classes
= 678 - 132
= 546
3 u + 6 u + 5 u = 546
14 u = 546
1 u = 546 ÷ 14 = 39
Total number of sweets sold by Class S and Class U
= 3 u + 5 u
= 8 u
= 8 x 39
= 312
Answer(s): 312