2 days ago, Opal had a total of 260 purple and white coins. 25% of her coins were white coins. Today, her older brother gave her some more coins. As a result, her purple coins increased by 40%. Now, 50% of her coins are white coins. How many white coins did her older brother give her?
| |
White coins |
Purple coins |
Total
coins |
| Before |
1 u |
3 u |
260 |
| Change |
+ 3.2 u |
+ 1.2 u |
|
| After |
4.2 u |
4.2 u |
|
Comparing the
purple coins and
white coins in the end |
1 |
1 |
|
25% =
25100 =
14 White coins : Purple coins = 1 : 3
Increase in the number of purple coins
= 40% x 3 u
=
40100 x 3 u
= 1.2 u
50% =
50100 =
12 In the end
White coins : Purple coins = 1 : 1
Number of coins at first
= 3 u + 1 u
= 4 u
4 u = 260
1 u = 260 ÷ 4 = 65
Number of white coins that Opal received from her older brother
= 4.2 u - 1 u
= 3.2 u
= 3.2 x 65
= 208
Answer(s): 208
