Adam has 30 green stickers and 90 blue stickers.
After giving away the same number of stickers,
the ratio of the green stickers and the blue stickers becomes 1 : 4.
How many stickers are given away?
|
Green |
Blue |
Difference |
Before |
30 |
90 |
60 |
Change |
- ? |
- ? |
|
After |
1 u |
4 u |
3 u |
At first
Difference in the number of stickers
= 90 - 30
= 60
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 green stickers and the blue stickers remains unchanged.
3 u = 60
1 u = 60 ÷ 3 = 20
Number of green stickers that Adam gives away
= 30 - 20
= 10
Total number of stickers that Adam gives away
= 2 x 10
= 20
Answer(s): 20