SOLUTION: Hi. If I have 2 gallons of a solution and add 1/2 gallon of water, how much is the solution diluted? Thanks for the help.

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Question 1045081: Hi. If I have 2 gallons of a solution and add 1/2 gallon of water, how much is the solution diluted? Thanks for the help.
Answer by ikleyn(52778) About Me  (Show Source):
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Hi. If I have 2 gallons of a solution and add 1/2 gallon of water, how much is the solution diluted? Thanks for the help.
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If "c" is your "old" concentration, then your new concentration is 


%282c%29%2F2.5 = %282%2F2.5%29%2Ac = 0.8*c.


For example, if the old concentration is 10%, then the new is 8%.