Bryan has 40 more stickers than Charlie.
After Charlie gives away 20 stickers,
Bryan has 4 times as many stickers as Charlie.
- How many stickers does Charlie have at first?
- How many stickers does Bryan have?
- How many stickers do they have altogether at first?
- How many stickers do they have altogether in the end?
|
Bryan |
Charlie |
Before |
1 u + 20 + 40 |
1 u + 20 |
Change |
No change |
- 20 |
After |
4 u |
1 u |
(a)
The number of stickers that Bryan has at first and in the end remains unchanged.
Number of stickers that Bryan has at first = Number of stickers that Bryan has in the end
1 u + 20 + 40 = 4 u
1 u + 60 = 4 u
4 u - 1 u = 60
3 u = 60
1 u = 60 ÷ 3 = 20
Number of stickers that Charlie has
= 1 u + 20
= 20 + 20
= 40
(b)
Number of stickers that Bryan has
= 4 u
= 4 x 20
= 80
(c)
Number of stickers that they have altogether at first
= 1 u + 20 + 40 + 1 u + 20
= 1 u + 1 u + 20 + 40 + 20
= 2 u + 80
= 2 x 20 + 80
= 40 + 80
= 120
(d)
Number of stickers that they have altogether in the end
= 4 u + 1 u
= 5 u
= 5 x 20
= 100
Answer(s): (a) 40; (b) 80; (c) 120; (d) 100