There are 55 stickers in Container N and 35 stickers in Container P.
Some stickers are transferred from Container N to Container P.
Container P has 30 more stickers than Container N.
How many stickers are transferred from Container N to Container P?

	Container N	Container P
Before	55	35
Change	- ?	+ ?
After	1 u	1 u + 30

Total number of stickers
= 55 + 35
= 90

In the end
Total number of stickers = 1 u + 1 u + 30 = 2 u + 30

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

2 u + 30 = 90
2 u = 90 - 30 = 60

1 u = 60 ÷ 2 = 30

Number of stickers that are transferred from Container N to Container P
= Number of stickers in Container N at first - Number of stickers in Container N in the end
= 55 - 30
= 25

Answer(s): 25