The sum of the ages of andy and derek is 50. in 5 years time, the age of derek will be four times that of andy now. how old is each boy

The architect's side view drawing of a saltbox-style house shows a post that supports the roof ridge. the support post is 8 ft tall. the distance from the front of the house to the support post is less than the distance from the post to the back of the house. how far from the front of the house is the support post positioned?