2 days ago, Tammy had a total of 220 pink and gold pens. 25% of her pens were gold pens. Today, her auntie gave her some more pens. As a result, her pink pens increased by 40%. Now, 50% of her pens are gold pens. How many gold pens did her auntie give her?
| |
Gold pens |
Pink pens |
Total
pens |
| Before |
1 u |
3 u |
220 |
| Change |
+ 3.2 u |
+ 1.2 u |
|
| After |
4.2 u |
4.2 u |
|
Comparing the
pink pens and
gold pens in the end |
1 |
1 |
|
25% =
25100 =
14 Gold pens : Pink pens = 1 : 3
Increase in the number of pink pens
= 40% x 3 u
=
40100 x 3 u
= 1.2 u
50% =
50100 =
12 In the end
Gold pens : Pink pens = 1 : 1
Number of pens at first
= 3 u + 1 u
= 4 u
4 u = 220
1 u = 220 ÷ 4 = 55
Number of gold pens that Tammy received from her auntie
= 4.2 u - 1 u
= 3.2 u
= 3.2 x 55
= 176
Answer(s): 176
