CATTLE. 235 



dent corn, and 412 pounds of protein in 2436 pounds of wheat middlings, 

 and the digestible protein in the above named amounts of corn and mid- 

 dlings are of equal value; at the present price of corn and middlings, what 

 are we paying per pound for the extra 256 pounds of protein contained 

 in the wheat middlings? 



7. If one ton of Old Process Linseed meal contains 960 pounds of 

 carbohydrates and one ton of corn meal contains 1442 pounds of carbo- 

 hydrates, how many pounds of O. P. Linseed meal will be required to 

 furnish the amount of carbohydrates contained in one ton of corn meal? 



8. How many pounds of protein are there in one ton of corn meal? 

 In one ton and a half of linseed meal? 



9. At present prices find the difference in cost between the cost of 

 the protein in one ton of corn meal, and one ton of O. P. Linseed meal. 



10. A dairyman wishes to mix a feed that shall have a nutritive ratio 

 of 1 :6, how many pounds of ground corn and wheat bran should be added 

 to 20 pounds of red clover hay, to make a day's feed for a 1,000 pound 

 cow, giving 50 pounds of milk testing 4 per cent? 



Balance of mixture (ground corn and 



wheat bran) required 2.09 11.94 



One pound of ground corn 0.044 0.665 1:15 



One pound of wheat bran 0.119 0.476 1:4 



Two pounds of the mixture 0.163 1.141 1:7 



The nutritive ratio i 17 is still too wide, so we must add 

 more bran which has a narrow nutritive ratio of 1 14, in such an 

 amount as will make the required ratio of 1 :6. 



AN ALGEBRAIC SOLUTION. 



Let x = the amount of protein that must be added to 0.163- pounds. 

 Let y = the amount of carbo's that must be added to 1.141 pounds. 

 Then we have the equation: 



x : y : : I 1 : 4 



163 -f x : 1.141 + y : : 1 :6 



x = .0815, and y = .326 pounds. 



