Bryan and Adam have 100 stickers.
After Bryan gives Adam 10 stickers,
Bryan has 70 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 + 80 |
1 u - 10 |
Change |
- 10 |
+ 10 |
After |
1 u + 70 |
1 u |
(a)
Total number of stickers
= 1 u + 1 u + 70
= 2 u + 70
2 u + 70 = 100
2 u = 100 - 70
2 u = 30
1 u = 30 ÷ 2 = 15
Number of stickers that Bryan has at first
= 1 u + 80
= 15 + 80
= 95
(b)
Number of stickers that Adam has in the end
= 1 u
= 15
Answer(s): (a) 95; (b) 15