Class F, G and H were given some mochi balls to sell for their charity drive. The average number of mochi balls the 3 classes had at first was 200. After Class G sold thrice as many mochi balls as Class F and Class H sold ⁵₆ as many mochi balls as Class G, the average number of mochi balls the 3 classes had left was 44. How many mochi balls did Class F and Class H sell altogether?

Class F	Class G	Class H
1x2	3x2
	6x1	5x1
2 u	6 u	5 u

Class F : Class G : Class H
2 : 6 : 5

Total number of mochi balls that the 3 classes had at first
= 3 x 200
= 600

Number of mochi balls that the 3 classes left
= 3 x 44 
= 132

Number of mochi balls that were sold by 3 classes
= 600 - 132
= 468

2 u + 6 u + 5 u = 468
13 u = 468

1 u = 468 ÷ 13 = 36

Total number of mochi balls sold by Class F and Class H
= 2 u + 5 u
= 7 u
= 7 x 36
= 252

Answer(s): 252