448 MANUAL OF MILK PRODUCTS 



Computing fat recovered during separation. 



Problem 12 



A farmer separating 200 lb. of milk testing 5 per cent fat loses some 

 fat in the skimmed milk, some milk or cream is spilled, and a little 

 adheres to the utensils. He gets 30 lb. of cream testing 33 per cent fat. 

 What percentage of the fat in the whole milk does he recover in the 

 cream ? 



200 X .05 = 10, number of pounds of fat in milk 



30 X .33 = 9.9, number of pounds of fat in cream 



9.9 -i- 10 = .99 



.99 X 100 = 99, percentage of fat of the whole milk recovered in the 

 cream. Answer. 



Comparative value of different methods for disposing of milk and 

 its products. 



Many dairymen lose money when selling cream, by not charging a 

 price in proportion to the price obtained for milk. In computing a rela- 

 tive price for milk and cream it is best to reduce each to a fat-percentage 

 basis. 



Problem 13 



Milk dealer X sells milk testing 4 per cent fat at 8 cents a quart. 

 For how much a quart should he sell cream testing 32 per cent fat in 

 order to receive a price for the cream that is relative in amount to the 

 price received for the milk ? 



Milk dealer Y sells milk testing 3.5 per cent fat at 8 cents a quart. 



How much should he receive a quart for cream testing 29 per cent fat, 



in order that the price of the cream will be relative to that of the milk ? 



(X) 100 lb. of 32% cream will contain 32 lb. of fat (100 X .32 = 32) 



100 lb. of 4% milk will contain 4 lb. of fat (100 X .04 = 4) 



Therefore, a given quantity of cream will contain 8 times as much 

 fat as the same quantity of milk (32 -=-4 =8). The cream should 

 therefore be worth 8 times as much as the milk. Since the milk sold 

 for 8 cents a quart, the cream should sell for 8 cents X 8, or 64 cents. 

 Answer. 



(Y) 100 lb. of 29% cream will contain 29 lb. of fat (100 X .29 = 29) 

 100 lb. of 3.5 % milk will contain 3.5 lb. of fat (100 X .035 = 3.5) 

 29 -=- 3.5 = 8.28 



The cream should be worth 8.28 times as much as the milk, or 8 cents 

 X 8.28, which is 66 cents. Answer. 



