12 days ago, Gabby had a total of 150 brown and green coins. 20% of her coins were green coins. Today, her auntie gave her some more coins. As a result, her brown coins increased by 30%. Now, 50% of her coins are green coins. How many green coins did her auntie give her?
| |
Green coins |
Brown coins |
Total
coins |
| Before |
1 u |
4 u |
150 |
| Change |
+ 4.2 u |
+ 1.2 u |
|
| After |
5.2 u |
5.2 u |
|
Comparing the
brown coins and
green coins in the end |
1 |
1 |
|
20% =
20100 =
15 Green coins : Brown coins = 1 : 4
Increase in the number of brown coins
= 30% x 4 u
=
30100 x 4 u
= 1.2 u
50% =
50100 =
12 In the end
Green coins : Brown coins = 1 : 1
Number of coins at first
= 4 u + 1 u
= 5 u
5 u = 150
1 u = 150 ÷ 5 = 30
Number of green coins that Gabby received from her auntie
= 5.2 u - 1 u
= 4.2 u
= 4.2 x 30
= 126
Answer(s): 126
