Adam has 20 blue beads and 210 green beads.
After buying the same number of beads,
the ratio of the blue beads and the green beads becomes 3 : 8.
How many beads does he buy?
|
Blue |
Green |
Difference |
Before |
20 |
210 |
190 |
Change |
+ ? |
+ ? |
|
After |
3 u |
8 u |
5 u |
At first
Difference in the number of beads
= 210 - 20
= 190
In the end
Number of blue beads = 3 u
Number of green beads = 8 u
Difference in the number of beads in units
= 8 u - 3 u
= 5 u
The difference in the number of beads between the blue beads and the green beads remains unchanged.
5 u = 190
1 u = 190 ÷ 5 = 38
Number of blue beads that Adam buys
= 3 u - 20
= 3 x 38 - 20
= 114 - 20
= 94
Total number of beads that Adam buys
= 2 x 94
= 188
Answer(s): 188