S2 



A Handbook for Dairymen 



the materials to be mixed. Subtract the number in 

 the center from the larger number at the left of the 

 rectangle. Place the remainder on the diagonally 

 opposite right-hand corner of the rectangle. Sub- 

 tract the smaller number on the left-hand corner 

 from the number in the center and place the re- 

 mainder on the diagonally opposite right-hand 

 corner of the rectangle. 



The two numbers on the right-hand corners of the 

 rectangle represent the number of pounds of ma- 

 terial required. If these two numbers are added, 

 they will express the number of pounds of the mix- 

 ture, which will contain a percentage of fat expressed 

 by the number in the center of the rectangle. In 

 each case the number on the right-hand corner cor- 

 responds in fat test to the number on the left-hand 

 corner directly opposite. 



Problem. 



How many pounds of 40 per cent cream and 3 per 

 cent milk must be mixed to make milk testing 5 per 

 cent.? Using the diagram as described, the following 

 result is obtained: 



This means that if 2 pounds of 40 per cent cream 

 are mixed with 35 pounds of 3 per cent milk, the re- 



