SOLUTION: To the nearest mL, how much 0.1% ampicillin in solution do you have to add to 40 mL of 0.5% ampicillin in solution to have 0.4 mL ampicillin total?

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Question 424551: To the nearest mL, how much 0.1% ampicillin in solution do you have to add to 40 mL of 0.5% ampicillin in solution to have 0.4 mL ampicillin total?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
40x.005=.2
.4-.2=.2
.001m=.2
m=.2/.001=200
You need 200 mL of .1% ampicillin for your solution..