There are 70 stickers in Container M and 20 stickers in Container N.
Some stickers are transferred from Container M to Container N.
Container N has 10 more stickers than Container M.
How many stickers are transferred from Container M to Container N?

	Container M	Container N
Before	70	20
Change	- ?	+ ?
After	1 u	1 u + 10

Total number of stickers
= 70 + 20
= 90

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

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

2 u + 10 = 90
2 u = 90 - 10 = 80

1 u = 80 ÷ 2 = 40

Number of stickers that are transferred from Container M to Container N
= Number of stickers in Container M at first - Number of stickers in Container M in the end
= 70 - 40
= 30

Answer(s): 30