15 days ago, Hazel had a total of 200 black and blue stickers. 25% of her stickers were blue stickers. Today, her auntie gave her some more stickers. As a result, her black stickers increased by 10%. Now, 50% of her stickers are blue stickers. How many blue stickers did her auntie give her?
| |
Blue stickers |
Black stickers |
Total
stickers |
| Before |
1 u |
3 u |
200 |
| Change |
+ 2.3 u |
+ 0.3 u |
|
| After |
3.3 u |
3.3 u |
|
Comparing the
black stickers and
blue stickers in the end |
1 |
1 |
|
25% =
25100 =
14 Blue stickers : Black stickers = 1 : 3
Increase in the number of black stickers
= 10% x 3 u
=
10100 x 3 u
= 0.3 u
50% =
50100 =
12 In the end
Blue stickers : Black stickers = 1 : 1
Number of stickers at first
= 3 u + 1 u
= 4 u
4 u = 200
1 u = 200 ÷ 4 = 50
Number of blue stickers that Hazel received from her auntie
= 3.3 u - 1 u
= 2.3 u
= 2.3 x 50
= 115
Answer(s): 115
