Adam and Bryan have a total of 400 stickers.
Adam gives Bryan 30 stickers.
Now, Adam has 80 more than Bryan.
- How many stickers does Adam have at first?
- How many stickers does Bryan have in the end?
|
Adam |
Bryan |
Total |
Before |
1 u + 110 |
1 u - 30 |
400 |
Change |
- 30 |
+ 30 |
|
After |
1 u + 80 |
1 u |
2 u + 80 |
(a)
In the end
Number of stickers that Adam has = 1 u + 80
Number of stickers that Bryan has = 1 u
Total number of stickers = 1 u + 1 u + 80 = 2 u + 80
At first
Number of stickers that Adam has = 1 u + 80 + 30 = 1 u + 110
Number of stickers that Bryan has = 1 u - 30
The total number of stickers at first and in the end remains unchanged.
Total number of stickers in the end = Total number of stickers at first
2 u + 80 = 400
2 u = 400 - 80
2 u = 320
1 u = 320 ÷ 2 = 160
Number of stickers that Adam has at first
= 1 u + 110
= 160 + 110
= 270
(b)
Number of stickers that Bryan has in the end
= 1 u
= 160
Answer(s): (a) 270; (b) 160