CREAMERY PROBLEMS. 281 



64. To find the approximate average test of sMm 

 milk, knowing the total butter fat in milk and in 

 cream separated, and knowing the number of 

 pounds of skim milk. 



Problem Milk contained 2,540 lbs. butter fat, 

 and the cream contained 2,500. lbs. butter fat. There 

 were 56,108. lbs. skim milk. Find the test of skim 

 milk. 



Rule Divide the difference in the amount of but- 

 ter fat in milk and cream by the skim milk pounds, 

 and multiply quotient by 100. The result is the 

 the test of the skim milk. 



Solution: 2,540—2,500=40; (40^56,108) X 100= 

 .071%. Ans. 



Explanation: First find the difference, which is 

 40 lbs. Then by dividing this by the number of 

 pounds of skim milk, and multiplying by 100, we get 

 the test per hundred pounds or in per cent. 



