Question 424734
As a nasal decongestant, doctors sometimes prescribe saline solutions with a concentration between 8% and 25%. In the old days, pharmacists had to create different mixtures but only needed to stock these two concentrations, since any percentage in between could be obtained using a mixture. So suppose an order comes in for an 18% solution. How many milliliters (mL) of the 25% solution must be mixed with 17 mL of the 8% solution to obtain the desired 18% solution? 
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I think you are right, the equation
.08(17) + .25x = .18(x+17)
x = 24.2857 ~ 24.286 ml of 25% stuff