212 MODERN METHODS OF TESTING MILK 



milk by the per cent, of fat in cream and multiply the 

 result by 100. Example : How many pounds of 

 cream containing 25 per cent, of fat are produced 

 from 100, pounds of milk containing 5 per cent, of fat? 

 5-r-25=.2. .2x100=20, number of pounds of cream 

 with 25 per cent, of fat. 



26. FINDING AMOUNT OF SKIM-MILK 



Rule. To find the amount of skim-milk for 100 

 pounds of milk when the per cent, of fat in milk and 

 in cream is known, find the amount of cream by Rule 

 25 and then subtract this from 100. Example : How 

 much skim-milk is produced from 100 pounds of milk 

 containing 4 per cent, of fat when the cream contains 

 25 per cent of fat? 4-^25=. 16; .16x100=16; 100 

 16=84, number of pounds of skim-milk. 



27. FINDING AMOUNT OF BUTTERMILK 



Rule. To find the amount of buttermilk for 100 

 pounds of milk when the per cent, of fat in milk and 

 in cream is known, multiply the amount of fat in 100 

 pounds of milk by 1.17 and subtract the result from 

 the amount of cream. Example: How many pounds 

 of buttermilk are produced for 100 pounds of milk 

 containing 4 per cent, of fat, when the cream used 

 contains 25 per cent, of fat? 4x1.17=4.68 (pounds 

 of butter made) ; 4-^-25x100=16 (pounds of 25 per 

 cent, cream) ; 16 4.68=11.32 (pounds of buttermilk). 



