Bryan and Adam have some stickers.
When Bryan gives Adam some stickers,
Bryan's stickers is doubled.
In the end, both have 40 stickers each.
- How many stickers does Adam have at first?
- How many stickers does Bryan have at first?
|
Bryan |
Adam |
Before |
1 u + 40 |
1 u |
Change |
- 1 u |
+ 1 u |
After |
40 |
2 u = 40 |
(a)
To double the number of stickers that Adam has
= 2 x 1 u
= 2 u
2 u = 40
1 u = 40 ÷ 2 = 20
Number of stickers that Adam has at first
= 1 u
= 20
(b)
Number of stickers that Bryan has at first
= 1 u + 40
= 20 + 40
= 60
Answer(s): (a) 20; (b) 60