There are 40 stickers in Container Y and 10 stickers in Container Z.
Some stickers are transferred from Container Y to Container Z.
Container Y has 10 more stickers than Container Z.
How many stickers are transferred from Container Y to Container Z?

	Container Y	Container Z
Before	40	10
Change	- ?	+ ?
After	1 u + 10	1 u

Total number of stickers
= 40 + 10
= 50

Total number of stickers in the end = 1 u + 10 + 1 u = 2 u + 10

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

2 u + 10 = 50
2 u = 50 - 10 = 40

1 u = 40 ÷ 2 = 20

Number of stickers that are transferred from Container Y to Container Z
= Number of stickers in Container Z in the end - Number of stickers in Container Z at first
= 20 - 10
= 10

Answer(s): 10