Bryan and Adam have 310 stickers.
After Bryan gives Adam 31 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 + 121 |
1 u - 31 |
Change |
- 31 |
+ 31 |
After |
1 u + 90 |
1 u |
(a)
Total number of stickers
= 1 u + 1 u + 90
= 2 u + 90
2 u + 90 = 310
2 u = 310 - 90
2 u = 220
1 u = 220 ÷ 2 = 110
Number of stickers that Bryan has at first
= 1 u + 121
= 110 + 121
= 231
(b)
Number of stickers that Adam has in the end
= 1 u
= 110
Answer(s): (a) 231; (b) 110