Adam and Bryan have 400 stickers.
After Adam gives Bryan 40 stickers,
Adam has 120 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 + 160 |
1 u - 40 |
Change |
- 40 |
+ 40 |
After |
1 u + 120 |
1 u |
(a)
Total number of stickers
= 1 u + 1 u + 120
= 2 u + 120
2 u + 120 = 400
2 u = 400 - 120
2 u = 280
1 u = 280 ÷ 2 = 140
Number of stickers that Adam has at first
= 1 u + 160
= 140 + 160
= 300
(b)
Number of stickers that Bryan has in the end
= 1 u
= 140
Answer(s): (a) 300; (b) 140