64 



FARM ARITHMETIC. 



141. What is the nutritive ratio of this ration? 



142. Beef loin is worth 25 cents per pound, butter 

 25 cents per pound, whole milk 3 cents per pound, and 

 crackers 5 cents per pound. What is the cost of the daily 

 ration ? 



Note. — For solution of 139, 140, and 141 follow same method as 

 used in compounding rations for animals. Consult table on page 

 61 for nutrient content. 



Cost of Nutrients. Cost is a factor of 

 considerable consequence in the selec- 

 tion of food materials. Where different 

 food materials are equally palatable, 

 nutritious, and otherwise suited for 

 nourishment, those furnishing the larg- 

 est amounts of available nutrients at 

 lowest cost naturally should be selected. 



143. When beef loin sells at 25 cents 

 per pound, how many pounds of digesti- 

 ble nutrient may be purchased for $1.00? 



Process : Since 1 pound costs $0.25, $1.00 will 

 buy 4 pounds. 



Beef loin contains — 

 In 100 In 4 



pounds pounds 



Protein, 15.6 ^100 X 4 = .62 



Fat, 16.6 -^ 100 X 4 = .66 



Quick cooling 

 of milk always 

 retards bacterial 

 growth. 



1.28 



Total, 



From four pounds of beef loin costing $1.00 the purchaser ob- 

 tains 1.28 pounds of digestible nutrients. 



144. What is the cost of 1 pound of digestible nutri- 

 ents ? 



100 -^ 1.28 = 78 Cents. 



145. When beef loin sells at 12^/2 cents per pound, 

 what amount of digestible nutrient is obtained for $1 .00 ? 



