10 days ago, Penelope had a total of 150 pink and yellow stickers. 20% of her stickers were yellow stickers. Today, her auntie gave her some more stickers. As a result, her pink stickers increased by 10%. Now, 50% of her stickers are yellow stickers. How many yellow stickers did her auntie give her?
| |
Yellow stickers |
Pink stickers |
Total
stickers |
| Before |
1 u |
4 u |
150 |
| Change |
+ 3.4 u |
+ 0.4 u |
|
| After |
4.4 u |
4.4 u |
|
Comparing the
pink stickers and
yellow stickers in the end |
1 |
1 |
|
20% =
20100 =
15 Yellow stickers : Pink stickers = 1 : 4
Increase in the number of pink stickers
= 10% x 4 u
=
10100 x 4 u
= 0.4 u
50% =
50100 =
12 In the end
Yellow stickers : Pink stickers = 1 : 1
Number of stickers at first
= 4 u + 1 u
= 5 u
5 u = 150
1 u = 150 ÷ 5 = 30
Number of yellow stickers that Penelope received from her auntie
= 4.4 u - 1 u
= 3.4 u
= 3.4 x 30
= 102
Answer(s): 102
