Adam and Bryan have a total of 500 stickers.
Adam gives Bryan 40 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 + 120 |
1 u - 40 |
500 |
Change |
- 40 |
+ 40 |
|
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 + 40 = 1 u + 120
Number of stickers that Bryan has = 1 u - 40
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 = 500
2 u = 500 - 80
2 u = 420
1 u = 420 ÷ 2 = 210
Number of stickers that Adam has at first
= 1 u + 120
= 210 + 120
= 330
(b)
Number of stickers that Bryan has in the end
= 1 u
= 210
Answer(s): (a) 330; (b) 210