Adam has 30 red stickers and 90 blue stickers.
After giving away the same number of stickers,
the ratio of the red stickers and the blue stickers becomes 1 : 6.
How many stickers are given away?
|
Red |
Blue |
Difference |
Before |
30 |
90 |
60 |
Change |
- ? |
- ? |
|
After |
1 u |
6 u |
5 u |
At first
Difference in the number of stickers
= 90 - 30
= 60
In the end
Difference in the number of stickers in units
= 6 u - 1 u
= 5 u
The difference in the number of stickers between the red stickers and the blue stickers remains unchanged.
5 u = 60
1 u = 60 ÷ 5 = 12
Number of red stickers that Adam gives away
= 30 - 12
= 18
Total number of stickers that Adam gives away
= 2 x 18
= 36
Answer(s): 36