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 throe folding doors, each 6' x 7' ; a 

 front door. 5' x 7' ; ten doors, 3' x 7', one of which is 

 an outside door. 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? 



