A soil sample was taken from a job site. It is brought back to the lab and baked. Prior to baking it was 130 lbs, after baking it was 115 lbs. What was the moisture content of the sample?

A soil sample was taken from a job site. It is brought back to the lab and baked. Prior to baking it was 130 lbs, after baking it was 115 lbs. What was the moisture content of the sample?