Class G, H and J were given some mini cupcakes to sell for their donation drive. The average number of mini cupcakes the 3 classes had at first was 236. After Class H sold twice as many mini cupcakes as Class G and Class J sold ⁷₈ as many mini cupcakes as Class H, the average number of mini cupcakes the 3 classes had left was 46. How many mini cupcakes did Class G and Class J sell altogether?

Class G	Class H	Class J
1x4	2x4
	8x1	7x1
4 u	8 u	7 u

Class G : Class H : Class J
4 : 8 : 7

Total number of mini cupcakes that the 3 classes had at first
= 3 x 236
= 708

Number of mini cupcakes that the 3 classes left
= 3 x 46 
= 138

Number of mini cupcakes that were sold by 3 classes
= 708 - 138
= 570

4 u + 8 u + 7 u = 570
19 u = 570

1 u = 570 ÷ 19 = 30

Total number of mini cupcakes sold by Class G and Class J
= 4 u + 7 u
= 11 u
= 11 x 30
= 330

Answer(s): 330