Class A, B and C were given some sweets to sell for their fund-raising project. The average number of sweets the 3 classes had at first was 241. After Class B sold thrice as many sweets as Class A and Class C sold ⁵₆ as many sweets as Class B, the average number of sweets the 3 classes had left was 59. How many sweets did Class A and Class C sell altogether?

Class A	Class B	Class C
1x2	3x2
	6x1	5x1
2 u	6 u	5 u

Class A : Class B : Class C
2 : 6 : 5

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

Number of sweets that the 3 classes left
= 3 x 59 
= 177

Number of sweets that were sold by 3 classes
= 723 - 177
= 546

2 u + 6 u + 5 u = 546
13 u = 546

1 u = 546 ÷ 13 = 42

Total number of sweets sold by Class A and Class C
= 2 u + 5 u
= 7 u
= 7 x 42
= 294

Answer(s): 294