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Question: thirtytwo g of a food sample were blended with 68...

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  1. Thirty-two g of a food sample were blended with 68 ml of water. Two successive dilutions of 1:100 were made and 0 ml dilution was plated After incubation 48 colonies were counted.

Dilution factor:=

Bacteria/ g =

  1. Thirty-two g of a food sample were blended with 168 ml of water. Two successive dilutions of 1/10 were made. Instead of adding 1.0 ml of the highest dilution, 1.1 was inadvertently added to the plate. After incubation, 148 colonies were counted. What is the count in bacteria/g of sample?

Dilution factor=

Bacteria/ g=

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