6 days ago, Cathy had a total of 160 yellow and green stickers. 30% of her stickers were green stickers. Today, her older sister gave her some more stickers. As a result, her yellow stickers increased by 25%. Now, 50% of her stickers are green stickers. How many green stickers did her older sister give her?

	Green stickers	Yellow 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 yellow stickers and green stickers in the end	1	1

30% = ³⁰₁₀₀ = ³₁₀

Green stickers : Yellow stickers = 3 : 7

Increase in the number of yellow stickers
= 25% x 7 u
= ²⁵₁₀₀ x 7 u
= 1.75 u

50% = ⁵⁰₁₀₀ = ¹₂

In the end
Green stickers : Yellow stickers = 1 : 1

Number of stickers at first
= 7 u + 3 u
= 10 u 

10 u = 160

1 u = 160 ÷ 10 = 16

Number of green stickers that Cathy received from her older sister
= 8.75 u - 3 u
= 5.75 u
= 5.75 x 16
= 92

Answer(s): 92