3 days ago, Natalie had a total of 125 brown and green buttons. 20% of her buttons were green buttons. Today, her mother gave her some more buttons. As a result, her brown buttons increased by 40%. Now, 50% of her buttons are green buttons. How many green buttons did her mother give her?
| |
Green buttons |
Brown buttons |
Total
buttons |
| Before |
1 u |
4 u |
125 |
| Change |
+ 4.6 u |
+ 1.6 u |
|
| After |
5.6 u |
5.6 u |
|
Comparing the
brown buttons and
green buttons in the end |
1 |
1 |
|
20% =
20100 =
15 Green buttons : Brown buttons = 1 : 4
Increase in the number of brown buttons
= 40% x 4 u
=
40100 x 4 u
= 1.6 u
50% =
50100 =
12 In the end
Green buttons : Brown buttons = 1 : 1
Number of buttons at first
= 4 u + 1 u
= 5 u
5 u = 125
1 u = 125 ÷ 5 = 25
Number of green buttons that Natalie received from her mother
= 5.6 u - 1 u
= 4.6 u
= 4.6 x 25
= 115
Answer(s): 115
