There are 25% more grey cards than pink cards in a bag. After Will removed 20% of the grey cards and increased the number of pink cards by 10%, there are now 24 fewer grey cards than pink cards. Find the number of pink cards at first.

	Grey	Pink
Before	5 u	4 u
Change	- 1 u	+ 0.4 u
After	4 u	4.4 u

Number of grey cards in percentage
= 100% + 25%
= 125%

125% = ¹²⁵₁₀₀ = ⁵₄

Number of grey cards that Will removed
= 20% x 5 u
= ²⁰₁₀₀ x 5 u 
= 1 u

Number of pink cards that Will increased 
= 10% x 4 u
= ¹⁰₁₀₀  x 4 u
= 0.4 u

Number of grey cards in the end
= 5 u - 1 u
= 4 u

Number of pink cards in the end
= 4 u + 0.4 u
= 4.4 u

Number of fewer grey cards than pink cards in the end
= 4.4 u - 4 u 
= 0.4 u 

0.4 u = 24

1 u = 24 ÷ 0.4 = 60

Number of pink cards at first
= 4 u
= 4 x 60
= 240

Answer(s): 240