Adam has 30 red stickers and 60 green stickers.
After giving away the same number of stickers,
the ratio of the red stickers and the green stickers becomes 1 : 4.
How many stickers are given away?
|
Red |
Green |
Difference |
Before |
30 |
60 |
30 |
Change |
- ? |
- ? |
|
After |
1 u |
4 u |
3 u |
At first
Difference in the number of stickers
= 60 - 30
= 30
In the end
Difference in the number of stickers in units
= 4 u - 1 u
= 3 u
The difference in the number of stickers between the red stickers and the green stickers remains unchanged.
3 u = 30
1 u = 30 ÷ 3 = 10
Number of red stickers that Adam gives away
= 30 - 10
= 20
Total number of stickers that Adam gives away
= 2 x 20
= 40
Answer(s): 40