524 FARM AND SCHOOL PROBLEMS. 



NOTE. The price per ton is twice the price per thousand. 

 Thousands multiplied by one-half the price per ton will be the 

 cost, or if the number of pounds is equal to one or more tons, 

 place the decimal point to the right of the thousands and divide 

 price per ton by 2 and multiply by the price per thousand, thus 

 3,625 pounds of steel @ 40 dollars per ton = (3.625) X ($40-^ 

 2) = $72.50. 



A retailer who sells hay in small quantities usually multiplies 

 the number of pounds of hay by the price per hundred. 



To find the price per hundred, we can divide the price per 

 ton by 20, but since one twentieth of 2,000 is the same as one- 

 tenth of two thousand divided by two, the simplest and quickest 

 method to find the price per hundred is to remove the decimal 

 point one place to the left in the price per ton and divide that by 

 2. Thus i ton of hay at 21 dollars is the same as $2.1 divided by 

 2 = $1.05 which is the price per hundred. 



1. What will 2 bales of hay each weighing 215 pounds, cost (o> 

 22.50 a ton? 



2. Find the cost of 325 tile @ $9.50 per thousand, and 750 brick 

 @ $8.40 per thousand ; 1,256 feet of lumber @ 16 dollars per M. 

 2,345 pounds of coal @ 7.30 per ton. 



Have a contest among the pupils to test their skill in the 

 solution of the above and similar problems. 



Weights of Different Materials per Cubic Foot. 



For the purpose of expressing the relation in weight between 

 different solids, water is usually taken as a standard. 



Water will vary in weight according to the substances that 

 it holds in solution, and also according to its temperature. 



The standard must be invariable, therefore, the standard 

 has been fixed as a cubic foot of distilled water at a temperature 

 of 4 Centigrade, or 39.2 Fahr., because at this temperature it 

 assumes its maximum density. 



Pure water, at this temperature will weigh 62.421 pounds, 

 but for all practical purposes in solving problems we shall cal- 

 culate the relation of water to other solids on the basis that water 

 weighs 62.5 pounds or 1,000 ounces per cubic foot. 



Specific Gravity is a term used to express how many times 

 as heavy a body is as an equal volume of water. 



