Class K, L and M were given some mini cupcakes to sell for their donation drive. The average number of mini cupcakes the 3 classes had at first was 232. After Class L sold twice as many mini cupcakes as Class K and Class M sold ³₄ as many mini cupcakes as Class L, the average number of mini cupcakes the 3 classes had left was 49. How many mini cupcakes did Class K and Class M sell altogether?

Class K	Class L	Class M
1x2	2x2
	4x1	3x1
2 u	4 u	3 u

Class K : Class L : Class M
2 : 4 : 3

Total number of mini cupcakes that the 3 classes had at first
= 3 x 232
= 696

Number of mini cupcakes that the 3 classes left
= 3 x 49 
= 147

Number of mini cupcakes that were sold by 3 classes
= 696 - 147
= 549

2 u + 4 u + 3 u = 549
9 u = 549

1 u = 549 ÷ 9 = 61

Total number of mini cupcakes sold by Class K and Class M
= 2 u + 3 u
= 5 u
= 5 x 61
= 305

Answer(s): 305