10 days ago, Kathy had a total of 260 red and yellow stickers. 25% of her stickers were yellow stickers. Today, her mother gave her some more stickers. As a result, her red stickers increased by 40%. Now, 50% of her stickers are yellow stickers. How many yellow stickers did her mother give her?
| |
Yellow stickers |
Red stickers |
Total
stickers |
| Before |
1 u |
3 u |
260 |
| Change |
+ 3.2 u |
+ 1.2 u |
|
| After |
4.2 u |
4.2 u |
|
Comparing the
red stickers and
yellow stickers in the end |
1 |
1 |
|
25% =
25100 =
14 Yellow stickers : Red stickers = 1 : 3
Increase in the number of red stickers
= 40% x 3 u
=
40100 x 3 u
= 1.2 u
50% =
50100 =
12 In the end
Yellow stickers : Red stickers = 1 : 1
Number of stickers at first
= 3 u + 1 u
= 4 u
4 u = 260
1 u = 260 ÷ 4 = 65
Number of yellow stickers that Kathy received from her mother
= 4.2 u - 1 u
= 3.2 u
= 3.2 x 65
= 208
Answer(s): 208
