234 FARM AND SCHOOL PROBLEMS. 



HOW TO USE THE TABLE. 



If wheat bran and cotton-seed meal are to be compared, 

 proceed as follows : Find the local price of corn in the upper 

 line, say 56 cents per bushel, or $20 per ton. Farther down the 

 same column, on the line headed "wheat bran" are the figures 

 $12:42, which is the value of the nutrients in a ton of bran minus 

 the 141 pounds of surplus protein shown in the last column to 

 the right. Subtract the $12.42 from the local price of bran, say 

 $25 per ton, and the result is $12.58 which is the cost of the 141 

 pounds of the surplus protein. Divide the $12.58 by 141 and the 

 result shows that the cost of the protein is 9 cents per pound. 

 Farther down the same column, on the line headed "cotton-seed 

 meal," are the figures $11.22, which is the value of the ton of 

 cotton-seed meal minus the surplus protein. Subtract this $11.22 

 from the local price of cotton-seed meal, say $35 per ton, and 

 the result is $23.78, or the cost of 610 pounds of surplus protein. 

 $23.78 divided by 610 equals 3.9 cents per pound. At these prices 

 the protein in the cotton-seed meal would cost less than one- 

 half as much as in wheat bran. 



Cost of Rations. 



It has been assumed as approximately true that the diges- 

 tible protein, carbohydrates and fat in corn are as valuable as in 

 any other feed. 



PROBLEMS. 



1. One ton of dent corn contains 1'56 pounds of digestible protein, 

 and 1530 pounds of digestible carbohydrate or, 1686 pounds of digestible 

 nutrients; what per cent of the digestible nutrients is protein? 



2. When corn is selling for $20 a ton, what is the cost of one pound 

 of digestible nutrients? 



3. If one ton of wheat midlings contains 1256 pounds of digestible 

 carbohydrate, how many pounds of wheat middlings must I purchase to 

 get the same number of pounds of digestible carbohydrate as are con- 

 tained in one ton of corn? 



4. If wheat middlings are 30 dollars per ton, what will be the cost 

 of 2436 pounds of middlings? 



5. Find the difference between the number of pounds of protein in 

 one ton of dent corn and 2436 pounds of wheat middlings. 



6. If there are approximately 156 pounds of protein in one ton of 



