200 MODERN METHODS OF TESTING MILK 



pounds of skim-milk. There would be 1,289 pounds 

 of 3.9 per cent. milk. 



(b) How much skim-milk is needed to produce 

 1,000 pounds of modified 3.9 per cent, milk? Divide 

 1,000 by 4.9, which gives 204.08. This, multiplied by 

 3.8, gives 775.5 pounds of 5 per cent, milk to use and, 

 multiplied by i.i, gives 224.5 pounds of skim-milk. 



EXAMPLES FOR PRACTICE 



(i) What amount of milk containing 4.7 per cent, 

 of fat, and of cream containing 30 per cent, of fat, 

 should be mixed in order to produce 740 pounds of 

 milk containing 6 per cent, of fat? 



(2) Mix milk containing 5.2 per cent, of fat with 

 milk containing 3.3 per cent of fat in such amounts 

 as to produce 950 pounds of milk containing 4.1 per 

 cent, of fat. 



(3) How many pounds of separator skim-milk must 

 be mixed with 100 pounds of cream containing 20 

 per cent, of fat in order to produce a modified milk 

 containing 5 per cent, of fat? 



(4) How many pounds of skim-milk must be mixed 

 with two pounds of 4.5 per cent, milk in order to pro- 

 duce a mixture containing 3 per cent, of fat? 



(5) How much skim-milk must be removed from 

 milk containing 3 per cent, of fat in order to increase 

 the fat to 3.7 per cent.? 



15. CORRECTING QUEVENNE LACTOMETER 

 READING FOR TEMPERATURE 



Rule. — For each degree F. above 60° F. add .1, and 

 for each degree below 60° F. subtract .1 (See p. 123). 



