Adam has 60 blue beads and 230 green beads.
After buying the same number of beads,
the ratio of the blue beads and the green beads becomes 3 : 5.
How many beads does he buy?
|
Blue |
Green |
Difference |
Before |
60 |
230 |
170 |
Change |
+ ? |
+ ? |
|
After |
3 u |
5 u |
2 u |
At first
Difference in the number of beads
= 230 - 60
= 170
In the end
Number of blue beads = 3 u
Number of green beads = 5 u
Difference in the number of beads in units
= 5 u - 3 u
= 2 u
The difference in the number of beads between the blue beads and the green beads remains unchanged.
2 u = 170
1 u = 170 ÷ 2 = 85
Number of blue beads that Adam buys
= 3 u - 60
= 3 x 85 - 60
= 255 - 60
= 195
Total number of beads that Adam buys
= 2 x 195
= 390
Answer(s): 390