STANDARDIZATION OF Miuc AND CREAM 



591 



EXAMPLE 2. 



2,000 Ibs. of 45 per cent cream are to be reduced to 33 per cent 

 cream by the use of 3 per cent milk. How much milk must be 

 added? 



45 30 



33. 



3 12 



30 : 12 -2000 :X;X = 800 



800 Ibs. of 3 per cent milk must be added to the 2000 Ibs. of 45 

 per cent cream in order to reduce the fat in the cream to 33 per cent. 



EXAMPLE 3. 



1000 Ibs. of milk testing 4.5 per cent fat are to be reduced to 

 milk testing 3.8 per cent fat. How much 40 per cent cream must 

 be removed by skimming? 



4.5 36.2 



3.8 



40 .7 



36.2 : .7 = 1000 : X ; X = 19.3 



19.3 Ibs. of 40 per cent cream must be removed from 1000 Ibs. 

 of 4.5 per cent milk in order to obtain milk testing 3.8 per cent fat, 

 after the skim milk is returned to that portion of the 4.5 per cent 

 milk which was not separated. 



EXAMPLE 4. 



How much of the 4.5 per cent milk in Example 3 must be run 

 through the separator to remove the 19.3 Ibs. of 40 per cent cream? 



4.5 

 Amount of 40 per cent cream of each 100 Ibs. of milk-^r X 100 



= 11.25 Ibs. 40 per cent cream. Hence, 11.25 : 100= 19.3 : X; X 

 = 171.55. 171.55 Ibs. of the 1000 Ibs. of 4.5 per cent milk must be 

 separated in order to remove 19.3 Ibs. of 40 per cent cream and 

 to reduce the per cent fat in the remaining milk, after the skim milk 

 is returned to it, to 3.8 per cent fat. 



