ARITHMETIC OF MILK AND MILK PRODUCTS 195 



3. FINDING PER CENT. OF SOLIDS IN MILK 



Rule. To find the per cent, of solids in milk when 

 the Quevenne lactometer reading and the per cent. 

 of fat are known, divide the lactometer reading by 4, 

 and to the result add the per cent, of fat multiplied by 

 1.2. (See p. 137.) 



4. FINDING PER CENT. OF SOLIDS-NOT-FAT 

 IN MILK 



Rule. To find the per cent, of solids-not-fat in 

 milk when the Quevenne lactometer reading and the 

 per cent, of fat are known, divide the lactometer read- 

 ing by 4, and to the result add the per cent, of fat 

 multiplied by .2. (See p. 137.) 



EXAMPLES FOR PRACTICE UNDER RULES 

 3 AND 4 



(1) What is the per cent, of solids in milk testing 

 4 per cent, of fat and showing a lactometer reading 

 of 32? 



(2) What is the per cent, of solids-not-fat in the 

 same milk as in (i) ? 



(3) What is the per cent, (a) of solids and (b) of 

 solids-not-fat in a milk testing 2.5 per cent, of fat 

 and showing a lactometer reading of 27? 



(4) What is the per cent, (a) of solids and (b) of 

 solids-not-fat in milk testing .2 per cent, of fat and 

 showing a lactometer reading of 36? 



