There are 90 stickers in Container A and 65 stickers in Container B.
Some stickers are transferred from Container A to Container B.
Container B has 35 more stickers than Container A.
How many stickers are transferred from Container A to Container B?

	Container A	Container B
Before	90	65
Change	- ?	+ ?
After	1 u	1 u + 35

Total number of stickers
= 90 + 65
= 155

In the end
Total number of stickers = 1 u + 1 u + 35 = 2 u + 35

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

2 u + 35 = 155
2 u = 155 - 35 = 120

1 u = 120 ÷ 2 = 60

Number of stickers that are transferred from Container A to Container B
= Number of stickers in Container A at first - Number of stickers in Container A in the end
= 90 - 60
= 30

Answer(s): 30