10 days ago, Emily had a total of 300 pink and red coins. 40% of her coins were red coins. Today, her father gave her some more coins. As a result, her pink coins increased by 30%. Now, 50% of her coins are red coins. How many red coins did her father give her?
| |
Red coins |
Pink coins |
Total
coins |
| Before |
2 u |
3 u |
300 |
| Change |
+ 1.9 u |
+ 0.9 u |
|
| After |
3.9 u |
3.9 u |
|
Comparing the
pink coins and
red coins in the end |
1 |
1 |
|
40% =
40100 =
25 Red coins : Pink coins = 2 : 3
Increase in the number of pink coins
= 30% x 3 u
=
30100 x 3 u
= 0.9 u
50% =
50100 =
12 In the end
Red coins : Pink coins = 1 : 1
Number of coins at first
= 3 u + 2 u
= 5 u
5 u = 300
1 u = 300 ÷ 5 = 60
Number of red coins that Emily received from her father
= 3.9 u - 2 u
= 1.9 u
= 1.9 x 60
= 114
Answer(s): 114
