Class N, P and Q were given some sweets to sell for their donation drive. The average number of sweets the 3 classes had at first was 203. After Class P sold thrice as many sweets as Class N and Class Q sold ⁷₈ as many sweets as Class P, the average number of sweets the 3 classes had left was 44. How many sweets did Class N and Class Q sell altogether?

Class N	Class P	Class Q
1x8	3x8
	8x3	7x3
8 u	24 u	21 u

Class N : Class P : Class Q
8 : 24 : 21

Total number of sweets that the 3 classes had at first
= 3 x 203
= 609

Number of sweets that the 3 classes left
= 3 x 44 
= 132

Number of sweets that were sold by 3 classes
= 609 - 132
= 477

8 u + 24 u + 21 u = 477
53 u = 477

1 u = 477 ÷ 53 = 9

Total number of sweets sold by Class N and Class Q
= 8 u + 21 u
= 29 u
= 29 x 9
= 261

Answer(s): 261