4 days ago, Cathy had a total of 250 white and green beads. 40% of her beads were green beads. Today, her auntie gave her some more beads. As a result, her white beads increased by 10%. Now, 50% of her beads are green beads. How many green beads did her auntie give her?
| |
Green beads |
White beads |
Total
beads |
| Before |
2 u |
3 u |
250 |
| Change |
+ 1.3 u |
+ 0.3 u |
|
| After |
3.3 u |
3.3 u |
|
Comparing the
white beads and
green beads in the end |
1 |
1 |
|
40% =
40100 =
25 Green beads : White beads = 2 : 3
Increase in the number of white beads
= 10% x 3 u
=
10100 x 3 u
= 0.3 u
50% =
50100 =
12 In the end
Green beads : White beads = 1 : 1
Number of beads at first
= 3 u + 2 u
= 5 u
5 u = 250
1 u = 250 ÷ 5 = 50
Number of green beads that Cathy received from her auntie
= 3.3 u - 2 u
= 1.3 u
= 1.3 x 50
= 65
Answer(s): 65
