CHAPTER XV 



Arithmetic of Milk and Milk Products 



In connection with the testing of milk and milk 

 products, especially in some of the practical applica- 

 tions, various arithmetical calculations are often nec- 

 essary. Special attention may need to be given to the 

 methods employed in solving such problems as are 

 presented, and a few pages are here devoted to the 

 treatment of some of the more common problems in 

 a systematic, comprehensive form, convenient for ready 

 reference. In creameries, cheese-factories, etc., where 

 much arithmetical work is involved in making divi- 

 dends, saving of time is effected by using calculations 

 or tables, which are published in book form. 



I. FINDING WEIGHT OF ANY CONSTITUENT 



Rule. To find the weight of any constituent in milk 

 or milk products, when the weight of the milk or its 

 product and the per cent, of the constituent are known, 

 multiply the weight by the number indicating the per 

 cent, of the constituent and divide the result by 100. 

 Example: How many pounds of fat in 675 pounds 

 of milk testing 4.6 per cent, of fat? 6?5 i X4 - 6 = 31.05, 

 the number of pounds of fat. 



193 



