Bryan and Adam have 390 stickers.
After Bryan gives Adam 39 stickers,
Bryan has 90 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 + 129 |
1 u - 39 |
Change |
- 39 |
+ 39 |
After |
1 u + 90 |
1 u |
(a)
Total number of stickers
= 1 u + 1 u + 90
= 2 u + 90
2 u + 90 = 390
2 u = 390 - 90
2 u = 300
1 u = 300 ÷ 2 = 150
Number of stickers that Bryan has at first
= 1 u + 129
= 150 + 129
= 279
(b)
Number of stickers that Adam has in the end
= 1 u
= 150
Answer(s): (a) 279; (b) 150