Class T, U and V were given some sweets to sell for their fund-raising project. The average number of sweets the 3 classes had at first was 238. After Class U sold twice as many sweets as Class T and Class V sold ²₃ as many sweets as Class U, the average number of sweets the 3 classes had left was 43. How many sweets did Class T and Class V sell altogether?

Class T	Class U	Class V
1x3	2x3
	3x2	2x2
3 u	6 u	4 u

Class T : Class U : Class V
3 : 6 : 4

Total number of sweets that the 3 classes had at first
= 3 x 238
= 714

Number of sweets that the 3 classes left
= 3 x 43 
= 129

Number of sweets that were sold by 3 classes
= 714 - 129
= 585

3 u + 6 u + 4 u = 585
13 u = 585

1 u = 585 ÷ 13 = 45

Total number of sweets sold by Class T and Class V
= 3 u + 4 u
= 7 u
= 7 x 45
= 315

Answer(s): 315