Class J, K and L were given some lollipops to sell for their fund-raising project. The average number of lollipops the 3 classes had at first was 213. After Class K sold thrice as many lollipops as Class J and Class L sold ⁵₆ as many lollipops as Class K, the average number of lollipops the 3 classes had left was 57. How many lollipops did Class J and Class L sell altogether?

Class J	Class K	Class L
1x2	3x2
	6x1	5x1
2 u	6 u	5 u

Class J : Class K : Class L
2 : 6 : 5

Total number of lollipops that the 3 classes had at first
= 3 x 213
= 639

Number of lollipops that the 3 classes left
= 3 x 57 
= 171

Number of lollipops that were sold by 3 classes
= 639 - 171
= 468

2 u + 6 u + 5 u = 468
13 u = 468

1 u = 468 ÷ 13 = 36

Total number of lollipops sold by Class J and Class L
= 2 u + 5 u
= 7 u
= 7 x 36
= 252

Answer(s): 252