Class V, W and X were given some mochi balls to sell for their donation drive. The average number of mochi balls the 3 classes had at first was 241. After Class W sold twice as many mochi balls as Class V and Class X sold ²₃ as many mochi balls as Class W, the average number of mochi balls the 3 classes had left was 46. How many mochi balls did Class V and Class X sell altogether?

Class V	Class W	Class X
1x3	2x3
	3x2	2x2
3 u	6 u	4 u

Class V : Class W : Class X
3 : 6 : 4

Total number of mochi balls that the 3 classes had at first
= 3 x 241
= 723

Number of mochi balls that the 3 classes left
= 3 x 46 
= 138

Number of mochi balls that were sold by 3 classes
= 723 - 138
= 585

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

1 u = 585 ÷ 13 = 45

Total number of mochi balls sold by Class V and Class X
= 3 u + 4 u
= 7 u
= 7 x 45
= 315

Answer(s): 315