FARM BUILDINGS. 179 



636. There are 24 windows, each 3' 6" x 5', in the 

 house. How many square yards are taken up by win- 

 dows? 



637. There are three folding doors, each 6' x 7'; a 

 front door, 5' x 7' ; ten doors, 3' x 7'. How many square 

 yards are taken up by door space ? 



638. Deducting door space and window space, how 

 many square yards are left to be plastered ? 



639. How many barrels of lime will be needed for two 

 coats of plaster for this house? 



640. How many bushels of hair or fiber? 



641. How many yards of sand? 



