Adam has 40 red stickers and 70 blue stickers.
After giving away the same number of stickers,
the ratio of the red stickers and the blue stickers becomes 1 : 4.
How many stickers are given away?
|
Red |
Blue |
Difference |
Before |
40 |
70 |
30 |
Change |
- ? |
- ? |
|
After |
1 u |
4 u |
3 u |
At first
Difference in the number of stickers
= 70 - 40
= 30
In the end
Difference in the number of stickers in units
= 4 u - 1 u
= 3 u
The difference in the number of stickers between the red stickers and the blue stickers remains unchanged.
3 u = 30
1 u = 30 ÷ 3 = 10
Number of red stickers that Adam gives away
= 40 - 10
= 30
Total number of stickers that Adam gives away
= 2 x 30
= 60
Answer(s): 60