There are 45 stickers in Container H and 30 stickers in Container J.
Some stickers are transferred from Container H to Container J.
Container J has 15 more stickers than Container H.
How many stickers are transferred from Container H to Container J?

	Container H	Container J
Before	45	30
Change	- ?	+ ?
After	1 u	1 u + 15

Total number of stickers
= 45 + 30
= 75

In the end
Total number of stickers = 1 u + 1 u + 15 = 2 u + 15

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

2 u + 15 = 75
2 u = 75 - 15 = 60

1 u = 60 ÷ 2 = 30

Number of stickers that are transferred from Container H to Container J
= Number of stickers in Container H at first - Number of stickers in Container H in the end
= 45 - 30
= 15

Answer(s): 15