How many mg is in 25cg?

I am greater than15 and less than 40 If you double me I become a number that ends in zero? What number goes into 53 and 12? Words that mean the same as procedure? What are the points of intersection between the equations of 2x plus y equals 5 and x2 -y2 equals 3? Is 87 an rational number? What is Half million in numbers? What German mathematician is famous for his proof that pi is a transcendental number? What is the word name for 3456? What numbers have an absolute value of 2 and one half? Is stems growing upward positive or negative? Is y2x-9 direct variation? How many times does 29 go into 139? Which areas of the Americas are the most populated? What are all numbers divisible by 3? How many micrograms are there in 0.9 milligrams? What is 2 divided by 2586? Is the number 100 a prime square triangle or a pentagonal? Sample of joining letter? 0.5 km equals how many meters? What is a graph with time plotted on the x axis and distance plotted on the y axis called?