Class R, S and T were given some lollipops to sell for their fund-raising project. The average number of lollipops the 3 classes had at first was 236. After Class S sold twice as many lollipops as Class R and Class T sold ⁴₅ as many lollipops as Class S, the average number of lollipops the 3 classes had left was 52. How many lollipops did Class R and Class T sell altogether?

Class R	Class S	Class T
1x5	2x5
	5x2	4x2
5 u	10 u	8 u

Class R : Class S : Class T
5 : 10 : 8

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

Number of lollipops that the 3 classes left
= 3 x 52 
= 156

Number of lollipops that were sold by 3 classes
= 708 - 156
= 552

5 u + 10 u + 8 u = 552
23 u = 552

1 u = 552 ÷ 23 = 24

Total number of lollipops sold by Class R and Class T
= 5 u + 8 u
= 13 u
= 13 x 24
= 312

Answer(s): 312