Class G, H and J were given some caramel apples to sell for their donation drive. The average number of caramel apples the 3 classes had at first was 235. After Class H sold thrice as many caramel apples as Class G and Class J sold ⁶₇ as many caramel apples as Class H, the average number of caramel apples the 3 classes had left was 51. How many caramel apples did Class G and Class J sell altogether?

Class G	Class H	Class J
1x7	3x7
	7x3	6x3
7 u	21 u	18 u

Class G : Class H : Class J
7 : 21 : 18

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

Number of caramel apples that the 3 classes left
= 3 x 51 
= 153

Number of caramel apples that were sold by 3 classes
= 705 - 153
= 552

7 u + 21 u + 18 u = 552
46 u = 552

1 u = 552 ÷ 46 = 12

Total number of caramel apples sold by Class G and Class J
= 7 u + 18 u
= 25 u
= 25 x 12
= 300

Answer(s): 300