There are 100 stickers in Container X and 80 stickers in Container Y.
Some stickers are transferred from Container X to Container Y.
Container Y has 70 more stickers than Container X.
How many stickers are transferred from Container X to Container Y?

	Container X	Container Y
Before	100	80
Change	- ?	+ ?
After	1 u	1 u + 70

Total number of stickers
= 100 + 80
= 180

In the end
Total number of stickers = 1 u + 1 u + 70 = 2 u + 70

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

2 u + 70 = 180
2 u = 180 - 70 = 110

1 u = 110 ÷ 2 = 55

Number of stickers that are transferred from Container X to Container Y
= Number of stickers in Container X at first - Number of stickers in Container X in the end
= 100 - 55
= 45

Answer(s): 45