3 days ago, Roshel had a total of 100 green and blue stickers. 25% of her stickers were blue stickers. Today, her cousin gave her some more stickers. As a result, her green stickers increased by 40%. Now, 50% of her stickers are blue stickers. How many blue stickers did her cousin give her?
| |
Blue stickers |
Green stickers |
Total
stickers |
| Before |
1 u |
3 u |
100 |
| Change |
+ 3.2 u |
+ 1.2 u |
|
| After |
4.2 u |
4.2 u |
|
Comparing the
green stickers and
blue stickers in the end |
1 |
1 |
|
25% =
25100 =
14 Blue stickers : Green stickers = 1 : 3
Increase in the number of green stickers
= 40% x 3 u
=
40100 x 3 u
= 1.2 u
50% =
50100 =
12 In the end
Blue stickers : Green stickers = 1 : 1
Number of stickers at first
= 3 u + 1 u
= 4 u
4 u = 100
1 u = 100 ÷ 4 = 25
Number of blue stickers that Roshel received from her cousin
= 4.2 u - 1 u
= 3.2 u
= 3.2 x 25
= 80
Answer(s): 80
