14 days ago, Abi had a total of 280 pink and silver beads. 40% of her beads were silver beads. Today, her younger brother gave her some more beads. As a result, her pink beads increased by 25%. Now, 50% of her beads are silver beads. How many silver beads did her younger brother give her?
| |
Silver beads |
Pink beads |
Total
beads |
| Before |
2 u |
3 u |
280 |
| Change |
+ 1.75 u |
+ 0.75 u |
|
| After |
3.75 u |
3.75 u |
|
Comparing the
pink beads and
silver beads in the end |
1 |
1 |
|
40% =
40100 =
25 Silver beads : Pink beads = 2 : 3
Increase in the number of pink beads
= 25% x 3 u
=
25100 x 3 u
= 0.75 u
50% =
50100 =
12 In the end
Silver beads : Pink beads = 1 : 1
Number of beads at first
= 3 u + 2 u
= 5 u
5 u = 280
1 u = 280 ÷ 5 = 56
Number of silver beads that Abi received from her younger brother
= 3.75 u - 2 u
= 1.75 u
= 1.75 x 56
= 98
Answer(s): 98
