Adam has 20 green stickers and 80 blue stickers.
After giving away the same number of stickers,
the ratio of the green stickers and the blue stickers becomes 1 : 7.
How many stickers are given away?
|
Green |
Blue |
Difference |
Before |
20 |
80 |
60 |
Change |
- ? |
- ? |
|
After |
1 u |
7 u |
6 u |
At first
Difference in the number of stickers
= 80 - 20
= 60
In the end
Difference in the number of stickers in units
= 7 u - 1 u
= 6 u
The difference in the number of stickers between the green stickers and the blue stickers remains unchanged.
6 u = 60
1 u = 60 ÷ 6 = 10
Number of green stickers that Adam gives away
= 20 - 10
= 10
Total number of stickers that Adam gives away
= 2 x 10
= 20
Answer(s): 20