Adam, Bryan and Charlie have some stickers in the ratio of 15 : 4 : 2.
Adam gives Bryan and Charlie a total of 120 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 Bryan?
- What is the number of stickers that Adam gives to Charlie?
|
Adam |
Bryan |
Charlie |
Before |
15 u |
4 u |
2 u |
Change |
- 8 u |
+ 3 u |
+ 5 u |
After |
7 u |
7 u |
7 u |
(a)
Total number of stickers
= 15 u + 4 u + 2 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
= 15 u - 7 u
= 8 u
8 u = 120
1 u = 120 ÷ 8 = 15
Total number of stickers
= 21 u
= 21 x 15
= 315
(b)
Number of stickers that Adam gives to Bryan
= 7 u - 4 u
= 3 u
= 3 x 15
= 45
(c)
Number of stickers that Adam gives to Charlie
= 7 u - 2 u
= 5 u
= 5 x 15
= 75
Answer(s): (a) 315; (b) 45; (c) 75