Adam has 600 stickers.
Bryan has 300 stickers.
Bryan receives some stickers from Adam.
Now, Adam has 200 more stickers than Bryan.

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

	Adam	Bryan	Total
Before	600	300	900
Change	- ?	+ ?
After	1 u + 200	1 u	2 u + 200

(a)
At first
Number of stickers that Adam has = 600
Number of stickers that Bryan has = 300
Total number of stickers = 600 + 300 = 900

In the end
Number of stickers that Adam has = 1 u + 200
Number of stickers that Bryan has = 1 u

Total number of stickers
= 1 u + 1 u + 200
= 2 u + 200

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 + 200 = 900
2 u = 900 - 200 = 700

1 u = 700 ÷ 2 = 350

Number of stickers that Adam in the end
= 1 u + 200
= 350 + 200
= 550

(b)
Number of stickers that Bryan has in the end
= 1 u
= 350

(c)
Number of stickers that Adam gives to Bryan
= 350 - 300
= 50

Answer(s): (a) 550; (b) 350; (c) 50