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 236. 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 44. 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 236
= 708

Number of chocolate bars that the 3 classes left
= 3 x 44 
= 132

Number of chocolate bars that were sold by 3 classes
= 708 - 132
= 576

2 u + 4 u + 3 u = 576
9 u = 576

1 u = 576 ÷ 9 = 64

Total number of chocolate bars sold by Class R and Class T
= 2 u + 3 u
= 5 u
= 5 x 64
= 320

Answer(s): 320