Bryan, Charlie and Adam have some stickers in the ratio of 12 : 4 : 5.
Bryan gives Charlie and Adam a total of 75 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 Bryan gives to Charlie?
- What is the number of stickers that Bryan gives to Adam?
|
Bryan |
Charlie |
Adam |
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 Bryan gives away
= 12 u - 7 u
= 5 u
5 u = 75
1 u = 75 ÷ 5 = 15
Total number of stickers
= 21 u
= 21 x 15
= 315
(b)
Number of stickers that Bryan gives to Charlie
= 7 u - 4 u
= 3 u
= 3 x 15
= 45
(c)
Number of stickers that Bryan gives to Adam
= 7 u - 5 u
= 2 u
= 2 x 15
= 30
Answer(s): (a) 315; (b) 45; (c) 30