Adam has 20 blue stickers and 60 red stickers.
After giving away the same number of stickers,
the ratio of the blue stickers and the red stickers becomes 1 : 5.
How many stickers are given away?
|
Blue |
Red |
Difference |
Before |
20 |
60 |
40 |
Change |
- ? |
- ? |
|
After |
1 u |
5 u |
4 u |
At first
Difference in the number of stickers
= 60 - 20
= 40
In the end
Difference in the number of stickers in units
= 5 u - 1 u
= 4 u
The difference in the number of stickers between the blue stickers and the red stickers remains unchanged.
4 u = 40
1 u = 40 ÷ 4 = 10
Number of blue stickers that Adam gives away
= 20 - 10
= 10
Total number of stickers that Adam gives away
= 2 x 10
= 20
Answer(s): 20