Do all composite numbers share a gcf that is greater than 1? explain

Based on what i know about mean, this doesn't add up.

David must install fencing around a lot that is shaped like a right angle.the side of lot that runs east-west is 200 ft long.the side of the lot runs north-south is 125 ft long.calculate how many feet of fencing he will need to surround the entire lot.

The sum of the reciprocal of a positive number and the reciprocal of 2 more than the number is 3/4 equation: the number is