Bryan and Adam have 200 stickers.
After Bryan gives Adam 20 stickers,
Bryan has 20 more stickers than Adam.
- How many stickers does Bryan have at first?
- How many stickers does Adam have in the end?
|
Bryan |
Adam |
Before |
1 u + 40 |
1 u - 20 |
Change |
- 20 |
+ 20 |
After |
1 u + 20 |
1 u |
(a)
Total number of stickers
= 1 u + 1 u + 20
= 2 u + 20
2 u + 20 = 200
2 u = 200 - 20
2 u = 180
1 u = 180 ÷ 2 = 90
Number of stickers that Bryan has at first
= 1 u + 40
= 90 + 40
= 130
(b)
Number of stickers that Adam has in the end
= 1 u
= 90
Answer(s): (a) 130; (b) 90