Adam has 50 blue stickers and 80 red stickers.
After giving away the same number of stickers,
the ratio of the blue stickers and the red stickers becomes 1 : 3.
How many stickers are given away?
|
Blue |
Red |
Difference |
Before |
50 |
80 |
30 |
Change |
- ? |
- ? |
|
After |
1 u |
3 u |
2 u |
At first
Difference in the number of stickers
= 80 - 50
= 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 red stickers remains unchanged.
2 u = 30
1 u = 30 ÷ 2 = 15
Number of blue stickers that Adam gives away
= 50 - 15
= 35
Total number of stickers that Adam gives away
= 2 x 35
= 70
Answer(s): 70