Bryan and Adam have some stickers.
When Bryan gives Adam some stickers,
Bryan's stickers is doubled.
In the end, both have 80 stickers each.
- How many stickers does Adam have at first?
- How many stickers does Bryan have at first?
|
Bryan |
Adam |
Before |
1 u + 80 |
1 u |
Change |
- 1 u |
+ 1 u |
After |
80 |
2 u = 80 |
(a)
To double the number of stickers that Adam has
= 2 x 1 u
= 2 u
2 u = 80
1 u = 80 ÷ 2 = 40
Number of stickers that Adam has at first
= 1 u
= 40
(b)
Number of stickers that Bryan has at first
= 1 u + 80
= 40 + 80
= 120
Answer(s): (a) 40; (b) 120