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 : 7.
How many stickers are given away?
|
Red |
Blue |
Difference |
Before |
40 |
70 |
30 |
Change |
- ? |
- ? |
|
After |
1 u |
7 u |
6 u |
At first
Difference in the number of stickers
= 70 - 40
= 30
In the end
Difference in the number of stickers in units
= 7 u - 1 u
= 6 u
The difference in the number of stickers between the red stickers and the blue stickers remains unchanged.
6 u = 30
1 u = 30 ÷ 6 = 5
Number of red stickers that Adam gives away
= 40 - 5
= 35
Total number of stickers that Adam gives away
= 2 x 35
= 70
Answer(s): 70