13 days ago, Yoko had a total of 280 gold and pink beads. 25% of her beads were pink beads. Today, her older brother gave her some more beads. As a result, her gold beads increased by 40%. Now, 50% of her beads are pink beads. How many pink beads did her older brother give her?
| |
Pink beads |
Gold beads |
Total
beads |
| Before |
1 u |
3 u |
280 |
| Change |
+ 3.2 u |
+ 1.2 u |
|
| After |
4.2 u |
4.2 u |
|
Comparing the
gold beads and
pink beads in the end |
1 |
1 |
|
25% =
25100 =
14 Pink beads : Gold beads = 1 : 3
Increase in the number of gold beads
= 40% x 3 u
=
40100 x 3 u
= 1.2 u
50% =
50100 =
12 In the end
Pink beads : Gold beads = 1 : 1
Number of beads at first
= 3 u + 1 u
= 4 u
4 u = 280
1 u = 280 ÷ 4 = 70
Number of pink beads that Yoko received from her older brother
= 4.2 u - 1 u
= 3.2 u
= 3.2 x 70
= 224
Answer(s): 224
