Adam and Bryan have 490 stickers.
After Adam gives Bryan 49 stickers,
Adam has 90 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 + 139 |
1 u - 49 |
Change |
- 49 |
+ 49 |
After |
1 u + 90 |
1 u |
(a)
Total number of stickers
= 1 u + 1 u + 90
= 2 u + 90
2 u + 90 = 490
2 u = 490 - 90
2 u = 400
1 u = 400 ÷ 2 = 200
Number of stickers that Adam has at first
= 1 u + 139
= 200 + 139
= 339
(b)
Number of stickers that Bryan has in the end
= 1 u
= 200
Answer(s): (a) 339; (b) 200