Class R, S and T were given some chocolate bars to sell for their donation drive. The average number of chocolate bars the 3 classes had at first was 228. After Class S sold twice as many chocolate bars as Class R and Class T sold
34 as many chocolate bars as Class S, the average number of chocolate bars the 3 classes had left was 60. How many chocolate bars did Class R and Class T sell altogether?
Class R |
Class S |
Class T |
1x2 |
2x2 |
|
|
4x1 |
3x1 |
2 u |
4 u |
3 u |
Class R : Class S : Class T
2 : 4 : 3
Total number of chocolate bars that the 3 classes had at first
= 3 x 228
= 684
Number of chocolate bars that the 3 classes left
= 3 x 60
= 180
Number of chocolate bars that were sold by 3 classes
= 684 - 180
= 504
2 u + 4 u + 3 u = 504
9 u = 504
1 u = 504 ÷ 9 = 56
Total number of chocolate bars sold by Class R and Class T
= 2 u + 3 u
= 5 u
= 5 x 56
= 280
Answer(s): 280