RULES AND MEASURES. 227 



Suggestion: Note that cotton meal is worth 2.19 times as 

 much as cottonseed and that there are 6G 2/3 bushels of seed in 

 a ton. 



829. On basis of even exchange; when cottonseed 

 meal is worth $30 a ton, what is seed worth a bushel? 



830. When cottonseed meal is worth $28 a ton, what 

 is seed worth at the mill if the cost of hauling is 2 cents 

 a bushel? 



831. When cottonseed meal is worth $30 a ton, what 

 should the farmer receive for seed per bushel at the mill 

 if the cost of hauling is $3 a ton? 



832. When cottonseed is bought at the mill for 40 

 cents a bushel, what should cottonseed meal be worth 

 per ton, providing the oil extracted pays for cost of man- 

 ufacture? 



833. When cottonseed is bought for 25 cents per 

 bushel, what is the value of the meal per ton ? 



To measure land. 1. For a square or rectilinear field : 

 Multiply the length in rods by width in rods and divide 

 by 160, the number of square of rods in an acre. The re- 

 sult is the number of acres in the field. 



2. For a triangular field: From half the sum of the 

 three sides in rods subtract each side separately. Find 

 the continued product of the half sum. and the three re- 

 mainders. Divide the square root of the product by 160. 

 The result is the number of acres. If the field is a right- 

 angled triangle, i. e., one having two sides that are per- 

 pendicular to each other, take one-half of the product of 

 these two sides in rods and divide by 160. The result is 

 the number of acres. 



3. For a field irregular in shape: Divide up into tri- 



