Adam has 50 blue stickers and 70 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 |
50 |
70 |
20 |
Change |
- ? |
- ? |
|
After |
1 u |
5 u |
4 u |
At first
Difference in the number of stickers
= 70 - 50
= 20
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 = 20
1 u = 20 ÷ 4 = 5
Number of blue stickers that Adam gives away
= 50 - 5
= 45
Total number of stickers that Adam gives away
= 2 x 45
= 90
Answer(s): 90