QR applied math help

[GAdawg94]

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Ok, I have figured out with the log problems its always going to be numbers that are simple. Do you always need to use percentages to do these problems when dealing with populations that are depleted and then grow? I've seen a problem before somewhere with rabbits and a few on bacteria. These are common on the DAT, right? Thanks!!!

 

[Lnguyen7]

No, you don't always need to use percentages. The unit just cancels out. They can say 1 bacterium and 100 bacteria as initial population and you still get the same answer.

 

[DAT Destroyer]

Ok, I have figured out with the log problems its always going to be numbers that are simple. Do you always need to use percentages to do these problems when dealing with populations that are depleted and then grow? I've seen a problem before somewhere with rabbits and a few on bacteria. These are common on the DAT, right? Thanks!!!

Before the exposure to UV we have No. After the exposure we now have 0.01No.
For the bacteria to go back to the original population we have:
t =30 Log (No/0.01No) = 30 Log (1/0.01) 30 Log (100) = 30*2=60.