12 days ago, Shannon had a total of 280 green and pink pens. 40% of her pens were pink pens. Today, her mother gave her some more pens. As a result, her green pens increased by 25%. Now, 50% of her pens are pink pens. How many pink pens did her mother give her?
| |
Pink pens |
Green pens |
Total
pens |
| Before |
2 u |
3 u |
280 |
| Change |
+ 1.75 u |
+ 0.75 u |
|
| After |
3.75 u |
3.75 u |
|
Comparing the
green pens and
pink pens in the end |
1 |
1 |
|
40% =
40100 =
25 Pink pens : Green pens = 2 : 3
Increase in the number of green pens
= 25% x 3 u
=
25100 x 3 u
= 0.75 u
50% =
50100 =
12 In the end
Pink pens : Green pens = 1 : 1
Number of pens at first
= 3 u + 2 u
= 5 u
5 u = 280
1 u = 280 ÷ 5 = 56
Number of pink pens that Shannon received from her mother
= 3.75 u - 2 u
= 1.75 u
= 1.75 x 56
= 98
Answer(s): 98
