STANDARDIZATION OF OEEAM. 259 



of number of pounds of the t\vo kinds to mix to- 

 gether to reduce the richer cream to the butter fat 

 content desired : 



Rule I. Subtract the per cent of fat in the cream 

 to be used to add to heavy cream to dilute it from 

 the desired test. 



Rule II. Subtract the per cent of thin cream 

 from the test of the rich cream and divide the re- 

 iiiainder into the result obtained in the first subtrac- 

 tion. Multiply the quotient by 100 and the result 

 will be the per cent of the rich cream to be used in 

 standardizing the cream. 



Problem. How many pounds each of 50 per cent 

 and 25 per cent cream must be mixed together to 

 produce 1,000 lbs. of cream testing 40 per cent. 



Solution : 



40 per cent — 25 per cent^l5 per cent. 



15 per cent^-25 per cent= .6 per cent. 



50 per cent — 25 per cent=25 per cent. 

 .6X100^60 per cent, the per cent of 50 per cent 

 cream to be used for the standardization of cream. 

 1,000 lbs. of 40 per cent is wanted. Sixty per cent 

 of 1,000 lbs. equals 600 lbs., the number of pounds 

 of 50 per cent cream necessary. 40 per cent of the 

 25 per cent cream is to be added to the rich cream 

 to reduce the test to 40 per cent. 



Proof: 1,000 lbs. of 40 per cent eream^400 lbs. 

 butter fat. 



60 per cent of 1,000 lbs.=600 lbs. of 50 per cent 

 cream to be used. 



40 per cent of 1,000 lbs.=400 lbs. of 25 per cent 

 cream to be used. 



