Adam and Bryan have 90 stickers.
After Adam gives Bryan 9 stickers,
Adam has 80 more stickers than Bryan.
- How many stickers does Adam have at first?
- How many stickers does Bryan have in the end?
|
Adam |
Bryan |
Before |
1 u + 89 |
1 u - 9 |
Change |
- 9 |
+ 9 |
After |
1 u + 80 |
1 u |
(a)
Total number of stickers
= 1 u + 1 u + 80
= 2 u + 80
2 u + 80 = 90
2 u = 90 - 80
2 u = 10
1 u = 10 ÷ 2 = 5
Number of stickers that Adam has at first
= 1 u + 89
= 5 + 89
= 94
(b)
Number of stickers that Bryan has in the end
= 1 u
= 5
Answer(s): (a) 94; (b) 5