There are 25% more gold stamps than green stamps in a bag. After Ryan removed 20% of the gold stamps and increased the number of green stamps by 10%, there are now 16 fewer gold stamps than green stamps. Find the number of green stamps at first.

	Gold	Green
Before	5 u	4 u
Change	- 1 u	+ 0.4 u
After	4 u	4.4 u

Number of gold stamps in percentage
= 100% + 25%
= 125%

125% = ¹²⁵₁₀₀ = ⁵₄

Number of gold stamps that Ryan removed
= 20% x 5 u
= ²⁰₁₀₀ x 5 u 
= 1 u

Number of green stamps that Ryan increased 
= 10% x 4 u
= ¹⁰₁₀₀  x 4 u
= 0.4 u

Number of gold stamps in the end
= 5 u - 1 u
= 4 u

Number of green stamps in the end
= 4 u + 0.4 u
= 4.4 u

Number of fewer gold stamps than green stamps in the end
= 4.4 u - 4 u 
= 0.4 u 

0.4 u = 16

1 u = 16 ÷ 0.4 = 40

Number of green stamps at first
= 4 u
= 4 x 40
= 160

Answer(s): 160