13 days ago, Julie had a total of 200 grey and silver beads. 30% of her beads were silver beads. Today, her mother gave her some more beads. As a result, her grey beads increased by 10%. Now, 50% of her beads are silver beads. How many silver beads did her mother give her?
| |
Silver beads |
Grey beads |
Total
beads |
| Before |
3 u |
7 u |
200 |
| Change |
+ 4.7 u |
+ 0.7 u |
|
| After |
7.7 u |
7.7 u |
|
Comparing the
grey beads and
silver beads in the end |
1 |
1 |
|
30% =
30100 =
310 Silver beads : Grey beads = 3 : 7
Increase in the number of grey beads
= 10% x 7 u
=
10100 x 7 u
= 0.7 u
50% =
50100 =
12 In the end
Silver beads : Grey beads = 1 : 1
Number of beads at first
= 7 u + 3 u
= 10 u
10 u = 200
1 u = 200 ÷ 10 = 20
Number of silver beads that Julie received from her mother
= 7.7 u - 3 u
= 4.7 u
= 4.7 x 20
= 94
Answer(s): 94
