Adam has 60 red stickers and 230 blue stickers.
After buying the same number of stickers,
the ratio of the red stickers and the blue stickers becomes 3 : 8.
How many stickers does he buy?
|
Red |
Blue |
Difference |
Before |
60 |
230 |
170 |
Change |
+ ? |
+ ? |
|
After |
3 u |
8 u |
5 u |
At first
Difference in the number of stickers
= 230 - 60
= 170
In the end
Number of red stickers = 3 u
Number of blue stickers = 8 u
Difference in the number of stickers in units
= 8 u - 3 u
= 5 u
The difference in the number of stickers between the red stickers and the blue stickers remains unchanged.
5 u = 170
1 u = 170 ÷ 5 = 34
Number of red stickers that Adam buys
= 3 u - 60
= 3 x 34 - 60
= 102 - 60
= 42
Total number of stickers that Adam buys
= 2 x 42
= 84
Answer(s): 84