4 days ago, Diana had a total of 250 white and blue stickers. 30% of her stickers were blue stickers. Today, her auntie gave her some more stickers. As a result, her white stickers increased by 20%. Now, 50% of her stickers are blue stickers. How many blue stickers did her auntie give her?
| |
Blue stickers |
White stickers |
Total
stickers |
| Before |
3 u |
7 u |
250 |
| Change |
+ 5.4 u |
+ 1.4 u |
|
| After |
8.4 u |
8.4 u |
|
Comparing the
white stickers and
blue stickers in the end |
1 |
1 |
|
30% =
30100 =
310 Blue stickers : White stickers = 3 : 7
Increase in the number of white stickers
= 20% x 7 u
=
20100 x 7 u
= 1.4 u
50% =
50100 =
12 In the end
Blue stickers : White stickers = 1 : 1
Number of stickers at first
= 7 u + 3 u
= 10 u
10 u = 250
1 u = 250 ÷ 10 = 25
Number of blue stickers that Diana received from her auntie
= 8.4 u - 3 u
= 5.4 u
= 5.4 x 25
= 135
Answer(s): 135
