Adam has 40 blue stickers and 70 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 |
40 |
70 |
30 |
Change |
- ? |
- ? |
|
After |
1 u |
3 u |
2 u |
At first
Difference in the number of stickers
= 70 - 40
= 30
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 = 30
1 u = 30 ÷ 2 = 15
Number of blue stickers that Adam gives away
= 40 - 15
= 25
Total number of stickers that Adam gives away
= 2 x 25
= 50
Answer(s): 50