There are 45 stickers in Container P and 20 stickers in Container Q.
Some stickers are transferred from Container P to Container Q.
Container P has 15 more stickers than Container Q.
How many stickers are transferred from Container P to Container Q?

	Container P	Container Q
Before	45	20
Change	- ?	+ ?
After	1 u + 15	1 u

Total number of stickers
= 45 + 20
= 65

Total number of stickers in the end = 1 u + 15 + 1 u = 2 u + 15

The total number of stickers at first and in the end remains unchanged.

2 u + 15 = 65
2 u = 65 - 15 = 50

1 u = 50 ÷ 2 = 25

Number of stickers that are transferred from Container P to Container Q
= Number of stickers in Container Q in the end - Number of stickers in Container Q at first
= 25 - 20
= 5

Answer(s): 5