Bryan and Adam have some stickers.
When Bryan gives Adam some stickers,
Bryan's stickers is doubled.
In the end, both have 20 stickers each.
- How many stickers does Adam have at first?
- How many stickers does Bryan have at first?
|
Bryan |
Adam |
Before |
1 u + 20 |
1 u |
Change |
- 1 u |
+ 1 u |
After |
20 |
2 u = 20 |
(a)
To double the number of stickers that Adam has
= 2 x 1 u
= 2 u
2 u = 20
1 u = 20 ÷ 2 = 10
Number of stickers that Adam has at first
= 1 u
= 10
(b)
Number of stickers that Bryan has at first
= 1 u + 20
= 10 + 20
= 30
Answer(s): (a) 10; (b) 30