Adam has 40 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 : 3.
How many stickers are given away?
|
Green |
Blue |
Difference |
Before |
40 |
90 |
50 |
Change |
- ? |
- ? |
|
After |
1 u |
3 u |
2 u |
At first
Difference in the number of stickers
= 90 - 40
= 50
In the end
Difference in the number of stickers in units
= 3 u - 1 u
= 2 u
The difference in the number of stickers between the green stickers and the blue stickers remains unchanged.
2 u = 50
1 u = 50 ÷ 2 = 25
Number of green stickers that Adam gives away
= 40 - 25
= 15
Total number of stickers that Adam gives away
= 2 x 15
= 30
Answer(s): 30