There are 25% more red coins than green coins in a bag. After Glen removed 40% of the red coins and increased the number of green coins by 35%, there are now 216 fewer red coins than green coins. Find the number of green coins at first.

	Red	Green
Before	5 u	4 u
Change	- 2 u	+ 1.4 u
After	3 u	5.4 u

Number of red coins in percentage
= 100% + 25%
= 125%

125% = ¹²⁵₁₀₀ = ⁵₄

Number of red coins that Glen removed
= 40% x 5 u
= ⁴⁰₁₀₀ x 5 u 
= 2 u

Number of green coins that Glen increased 
= 35% x 4 u
= ³⁵₁₀₀  x 4 u
= 1.4 u

Number of red coins in the end
= 5 u - 2 u
= 3 u

Number of green coins in the end
= 4 u + 1.4 u
= 5.4 u

Number of fewer red coins than green coins in the end
= 5.4 u - 3 u 
= 2.4 u 

2.4 u = 216

1 u = 216 ÷ 2.4 = 90

Number of green coins at first
= 4 u
= 4 x 90
= 360

Answer(s): 360