14 days ago, Pamela had a total of 160 gold and blue stickers. 30% of her stickers were blue stickers. Today, her mother gave her some more stickers. As a result, her gold stickers increased by 25%. Now, 50% of her stickers are blue stickers. How many blue stickers did her mother give her?
| |
Blue stickers |
Gold stickers |
Total
stickers |
| Before |
3 u |
7 u |
160 |
| Change |
+ 5.75 u |
+ 1.75 u |
|
| After |
8.75 u |
8.75 u |
|
Comparing the
gold stickers and
blue stickers in the end |
1 |
1 |
|
30% =
30100 =
310 Blue stickers : Gold stickers = 3 : 7
Increase in the number of gold stickers
= 25% x 7 u
=
25100 x 7 u
= 1.75 u
50% =
50100 =
12 In the end
Blue stickers : Gold stickers = 1 : 1
Number of stickers at first
= 7 u + 3 u
= 10 u
10 u = 160
1 u = 160 ÷ 10 = 16
Number of blue stickers that Pamela received from her mother
= 8.75 u - 3 u
= 5.75 u
= 5.75 x 16
= 92
Answer(s): 92
