Class A, B and C were given some sweets to sell for their charity drive. The average number of sweets the 3 classes had at first was 235. After Class B sold twice as many sweets as Class A and Class C sold ³₄ as many sweets as Class B, the average number of sweets the 3 classes had left was 49. How many sweets did Class A and Class C sell altogether?

Class A	Class B	Class C
1x2	2x2
	4x1	3x1
2 u	4 u	3 u

Class A : Class B : Class C
2 : 4 : 3

Total number of sweets that the 3 classes had at first
= 3 x 235
= 705

Number of sweets that the 3 classes left
= 3 x 49 
= 147

Number of sweets that were sold by 3 classes
= 705 - 147
= 558

2 u + 4 u + 3 u = 558
9 u = 558

1 u = 558 ÷ 9 = 62

Total number of sweets sold by Class A and Class C
= 2 u + 3 u
= 5 u
= 5 x 62
= 310

Answer(s): 310