Adam has 50 blue stickers and 90 green stickers.
After giving away the same number of stickers,
the ratio of the blue stickers and the green stickers becomes 1 : 3.
How many stickers are given away?
|
Blue |
Green |
Difference |
Before |
50 |
90 |
40 |
Change |
- ? |
- ? |
|
After |
1 u |
3 u |
2 u |
At first
Difference in the number of stickers
= 90 - 50
= 40
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 blue stickers and the green stickers remains unchanged.
2 u = 40
1 u = 40 ÷ 2 = 20
Number of blue stickers that Adam gives away
= 50 - 20
= 30
Total number of stickers that Adam gives away
= 2 x 30
= 60
Answer(s): 60