There are 25% more silver stickers than yellow stickers in a bag. After Ken removed 20% of the silver stickers and increased the number of yellow stickers by 30%, there are now 60 fewer silver stickers than yellow stickers. Find the number of yellow stickers at first.

	Silver	Yellow
Before	5 u	4 u
Change	- 1 u	+ 1.2 u
After	4 u	5.2 u

Number of silver stickers in percentage
= 100% + 25%
= 125%

125% = ¹²⁵₁₀₀ = ⁵₄

Number of silver stickers that Ken removed
= 20% x 5 u
= ²⁰₁₀₀ x 5 u 
= 1 u

Number of yellow stickers that Ken increased 
= 30% x 4 u
= ³⁰₁₀₀  x 4 u
= 1.2 u

Number of silver stickers in the end
= 5 u - 1 u
= 4 u

Number of yellow stickers in the end
= 4 u + 1.2 u
= 5.2 u

Number of fewer silver stickers than yellow stickers in the end
= 5.2 u - 4 u 
= 1.2 u 

1.2 u = 60

1 u = 60 ÷ 1.2 = 50

Number of yellow stickers at first
= 4 u
= 4 x 50
= 200

Answer(s): 200