Bryan and Adam have 400 stickers.
After Bryan gives Adam 40 stickers,
Bryan has 280 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 + 320 |
1 u - 40 |
Change |
- 40 |
+ 40 |
After |
1 u + 280 |
1 u |
(a)
Total number of stickers
= 1 u + 1 u + 280
= 2 u + 280
2 u + 280 = 400
2 u = 400 - 280
2 u = 120
1 u = 120 ÷ 2 = 60
Number of stickers that Bryan has at first
= 1 u + 320
= 60 + 320
= 380
(b)
Number of stickers that Adam has in the end
= 1 u
= 60
Answer(s): (a) 380; (b) 60