Adam and Bryan have 210 stickers.
After Adam gives Bryan 21 stickers,
Adam has 100 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 + 121 |
1 u - 21 |
Change |
- 21 |
+ 21 |
After |
1 u + 100 |
1 u |
(a)
Total number of stickers
= 1 u + 1 u + 100
= 2 u + 100
2 u + 100 = 210
2 u = 210 - 100
2 u = 110
1 u = 110 ÷ 2 = 55
Number of stickers that Adam has at first
= 1 u + 121
= 55 + 121
= 176
(b)
Number of stickers that Bryan has in the end
= 1 u
= 55
Answer(s): (a) 176; (b) 55