If Bryan gives 20 stickers to Adam, both will have the same number of stickers.
If Adam gives 20 stickers to Bryan, Bryan has 9 times as many as Adam.
- How many stickers does Bryan have?
- How many stickers does Adam have?
- How many stickers do Bryan and Adam have altogether?
- How many stickers does Bryan have more than Adam?
|
Case 1 |
Case 2 |
|
Bryan |
Adam |
Bryan |
Adam |
Before |
5 u + 20 |
5 u - 20 |
9 u - 20 |
1 u + 20 |
Change |
- 20 |
+ 20 |
+ 20 |
- 20 |
After |
5 u |
5 u |
9 u |
1 u |
(a)
Total number of stickers in the end
= 9 u + 1 u
= 10 u
For scenario 1, Bryan and Adam have same number of stickers in the end.
Number of stickers that each boy has in the end
= 10 u ÷ 2
= 5 u
Number of stickers that Adam has at first in both scenarios is the same.
5 u - 20 = 1 u + 20
5 u - 1 u = 20 + 20
4 u = 40
1 u = 40 ÷ 4 = 10
Number of stickers that Bryan has
= 5 u + 20
= 5 x 10 + 20
= 50 + 20
= 70
(b)
Number of stickers that Adam has
= 1 u + 20
= 10 + 20
= 30
(c)
Total number of stickers
= 70 + 30
= 100
(d)
Number of stickers that Bryan has more than Adam
= 70 - 30
= 40
Answer(s): (a) 70; (b) 30; (c) 100; (d) 40