Class F, G and H were given some sweets to sell for their fund-raising project. The average number of sweets the 3 classes had at first was 249. After Class G sold twice as many sweets as Class F and Class H sold ³₄ as many sweets as Class G, the average number of sweets the 3 classes had left was 54. How many sweets did Class F and Class H sell altogether?

Class F	Class G	Class H
1x2	2x2
	4x1	3x1
2 u	4 u	3 u

Class F : Class G : Class H
2 : 4 : 3

Total number of sweets that the 3 classes had at first
= 3 x 249
= 747

Number of sweets that the 3 classes left
= 3 x 54 
= 162

Number of sweets that were sold by 3 classes
= 747 - 162
= 585

2 u + 4 u + 3 u = 585
9 u = 585

1 u = 585 ÷ 9 = 65

Total number of sweets sold by Class F and Class H
= 2 u + 3 u
= 5 u
= 5 x 65
= 325

Answer(s): 325