Question 626541
To the nearest mL, how much 0.3% ampicillin in solution do you have to add to 40mL of 0.8% ampicillin in solution to have 0.4% mL ampicillin total?
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let x=amt of .3% ampicillan to add
.3%x+.8%*40=.4%(40+x)
.003x+.32=.16+.004x
.001x=.16
x=.16/.001
x=160
amt of .3% ampicillan to add=160 ml