ii8 



DAIRY TECHNOLOGY 



II. (b) To obtain loo pounds of milk containing 4 

 per cent of fat from milk containing 3.2 per cent of fat by 

 the extraction of skim milk. 



Find pounds of fat required. Then divide the desired 

 pounds of fat by the per cant of fat in the known milk and 

 multiply the quotient by 100. The difference between 

 this product and the pounds of standardized milk is the 

 pounds of skim milk to be extracted. 



(4 -^ 3.2) X 100 = 125, which is the pounds of 3.2-per- 

 cent milk required to make 100 pounds of 4-per-cent milk. 



125 — 100 = 25 which is the pounds of skim milk to 

 be extracted. 



III. (a) To obtain milk containing 3.5 per cent of fat 



.Sparta of 4^ milk 



Fig. 28. 



Ho parta of 3.2^ milk 

 .8 parts of 3J>f milk 



from milk containing 4 per cent of fat, by the addition of 

 milk containing 3.2 per cent of fat. 



Same method as is used in solving I. (a). 



III. (b) To obtain 160 pounds of milk containing 3.5 

 per cent of fat from milk containing 4 per cent of fat, by the 

 addition of milk containing 3.2 per cent of fat. 



Same formula as is used in solving I. (a). 



0.8 : 160 : : 0.3 : 60. Hence 60 pounds of 4-per-cent 

 milk are required. 



