2 days ago, Pamela had a total of 200 red and green beads. 30% of her beads were green beads. Today, her grandmother gave her some more beads. As a result, her red beads increased by 25%. Now, 50% of her beads are green beads. How many green beads did her grandmother give her?
| |
Green beads |
Red beads |
Total
beads |
| Before |
3 u |
7 u |
200 |
| Change |
+ 5.75 u |
+ 1.75 u |
|
| After |
8.75 u |
8.75 u |
|
Comparing the
red beads and
green beads in the end |
1 |
1 |
|
30% =
30100 =
310 Green beads : Red beads = 3 : 7
Increase in the number of red beads
= 25% x 7 u
=
25100 x 7 u
= 1.75 u
50% =
50100 =
12 In the end
Green beads : Red beads = 1 : 1
Number of beads at first
= 7 u + 3 u
= 10 u
10 u = 200
1 u = 200 ÷ 10 = 20
Number of green beads that Pamela received from her grandmother
= 8.75 u - 3 u
= 5.75 u
= 5.75 x 20
= 115
Answer(s): 115
