Adam, Charlie and Bryan have some stickers in the ratio of 12 : 4 : 5.
Adam gives Charlie and Bryan a total of 100 stickers.
Now they have same number of stickers.
- What is the total number of stickers that they have?
- What is the number of stickers that Adam gives to Charlie?
- What is the number of stickers that Adam gives to Bryan?
|
Adam |
Charlie |
Bryan |
Before |
12 u |
4 u |
5 u |
Change |
- 5 u |
+ 3 u |
+ 2 u |
After |
7 u |
7 u |
7 u |
(a)
Total number of stickers
= 12 u + 4 u + 5 u
= 21 u
Number of stickers that each must have to be the same number
= 21 u ÷ 3
= 7 u
Number of stickers that Adam gives away
= 12 u - 7 u
= 5 u
5 u = 100
1 u = 100 ÷ 5 = 20
Total number of stickers
= 21 u
= 21 x 20
= 420
(b)
Number of stickers that Adam gives to Charlie
= 7 u - 4 u
= 3 u
= 3 x 20
= 60
(c)
Number of stickers that Adam gives to Bryan
= 7 u - 5 u
= 2 u
= 2 x 20
= 40
Answer(s): (a) 420; (b) 60; (c) 40