Bryan has 900 stickers.
Adam has 400 stickers.
Adam receives some stickers from Bryan.
Now, Bryan has 100 more stickers than Adam.

1. How many stickers does Bryan have in the end?
2. How many stickers does Adam have in the end?
3. How many stickers does Bryan give to Adam?

	Bryan	Adam	Total
Before	900	400	1300
Change	- ?	+ ?
After	1 u + 100	1 u	2 u + 100

(a)
At first
Number of stickers that Bryan has = 900
Number of stickers that Adam has = 400
Total number of stickers = 900 + 400 = 1300

In the end
Number of stickers that Bryan has = 1 u + 100
Number of stickers that Adam has = 1 u

Total number of stickers
= 1 u + 1 u + 100
= 2 u + 100

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

2 u + 100 = 1300
2 u = 1300 - 100 = 1200

1 u = 1200 ÷ 2 = 600

Number of stickers that Bryan in the end
= 1 u + 100
= 600 + 100
= 700

(b)
Number of stickers that Adam has in the end
= 1 u
= 600

(c)
Number of stickers that Bryan gives to Adam
= 600 - 400
= 200

Answer(s): (a) 700; (b) 600; (c) 200