Adam has 20 green stickers and 150 blue stickers.
After buying the same number of stickers,
the ratio of the green stickers and the blue stickers becomes 2 : 7.
How many stickers does he buy?
|
Green |
Blue |
Difference |
Before |
20 |
150 |
130 |
Change |
+ ? |
+ ? |
|
After |
2 u |
7 u |
5 u |
At first
Difference in the number of stickers
= 150 - 20
= 130
In the end
Number of green stickers = 2 u
Number of blue stickers = 7 u
Difference in the number of stickers in units
= 7 u - 2 u
= 5 u
The difference in the number of stickers between the green stickers and the blue stickers remains unchanged.
5 u = 130
1 u = 130 ÷ 5 = 26
Number of green stickers that Adam buys
= 2 u - 20
= 2 x 26 - 20
= 52 - 20
= 32
Total number of stickers that Adam buys
= 2 x 32
= 64
Answer(s): 64