Class T, U and V were given some chocolate bars to sell for their charity drive. The average number of chocolate bars the 3 classes had at first was 223. After Class U sold twice as many chocolate bars as Class T and Class V sold ³₄ as many chocolate bars as Class U, the average number of chocolate bars the 3 classes had left was 43. How many chocolate bars did Class T and Class V sell altogether?

Class T	Class U	Class V
1x2	2x2
	4x1	3x1
2 u	4 u	3 u

Class T : Class U : Class V
2 : 4 : 3

Total number of chocolate bars that the 3 classes had at first
= 3 x 223
= 669

Number of chocolate bars that the 3 classes left
= 3 x 43 
= 129

Number of chocolate bars that were sold by 3 classes
= 669 - 129
= 540

2 u + 4 u + 3 u = 540
9 u = 540

1 u = 540 ÷ 9 = 60

Total number of chocolate bars sold by Class T and Class V
= 2 u + 3 u
= 5 u
= 5 x 60
= 300

Answer(s): 300