There are 25% more pink stickers than grey stickers in a bag. After Seth removed 20% of the pink stickers and increased the number of grey stickers by 30%, there are now 96 fewer pink stickers than grey stickers. Find the number of grey stickers at first.

	Pink	Grey
Before	5 u	4 u
Change	- 1 u	+ 1.2 u
After	4 u	5.2 u

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

125% = ¹²⁵₁₀₀ = ⁵₄

Number of pink stickers that Seth removed
= 20% x 5 u
= ²⁰₁₀₀ x 5 u 
= 1 u

Number of grey stickers that Seth increased 
= 30% x 4 u
= ³⁰₁₀₀  x 4 u
= 1.2 u

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

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

Number of fewer pink stickers than grey stickers in the end
= 5.2 u - 4 u 
= 1.2 u 

1.2 u = 96

1 u = 96 ÷ 1.2 = 80

Number of grey stickers at first
= 4 u
= 4 x 80
= 320

Answer(s): 320