Bryan and Adam have a total of 400 stickers.
Bryan gives Adam 10 stickers.
Now, Bryan has 30 more than Adam.

1. How many stickers does Bryan have at first?
2. How many stickers does Adam have in the end?

	Bryan	Adam	Total
Before	1 u + 40	1 u - 10	400
Change	- 10	+ 10
After	1 u + 30	1 u	2 u + 30

(a)
In the end
Number of stickers that Bryan has = 1 u + 30
Number of stickers that Adam has = 1 u
Total number of stickers = 1 u + 1 u + 30 = 2 u + 30

At first
Number of stickers that Bryan has = 1 u + 30 + 10 = 1 u + 40
Number of stickers that Adam has = 1 u - 10

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 + 30 = 400
2 u = 400 - 30
2 u = 370

1 u = 370 ÷ 2 = 185

Number of stickers that Bryan has at first
= 1 u + 40
= 185 + 40
= 225

(b)
Number of stickers that Adam has in the end
= 1 u
= 185

Answer(s): (a) 225; (b) 185