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Homework Help! For my biology lab class more of a math problem though

#1 User is offline   pauline5 

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Posted 01 September 2007 - 10:58 PM

i hope someone can help me
here's the problem

If 1 ml of dye plus 2 ml of water gives a 0.33 dilution, what dilution is 1 ml of dye plus 3 ml of water?

thanks a ton in advance!
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#2 User is offline   ChunJin 

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Posted 01 September 2007 - 11:01 PM

(1 + 2) / 0.33 = (1 + 3) / x

Cross multiply and solve for x.

The key is to understand ratios.
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#3 User is offline   pauline5 

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Posted 02 September 2007 - 07:39 AM

oh that's what i thought i had to do but i wasn't sure
thank you so much <3
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