SOLUTION: A pharmacist wishes to mix a solution that is 5​% Minoxidil. She has on hand 90 ml of a 2​% solution and wishes to add some 7​% solution to obtain the desired 5&
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Question 1109318: A pharmacist wishes to mix a solution that is 5% Minoxidil. She has on hand 90 ml of a 2% solution and wishes to add some 7% solution to obtain the desired 5% solution. How much 7% solution should she add? Answer by ikleyn(52788) (Show Source):
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A pharmacist wishes to get a solution that is 5% Minoxidil.
She has on hand 90 ml of a 2% solution and wishes to add some 7% solution to obtain the desired 5% solution.
How much 7% solution should she add?
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pure Minoxidil amt + pure Minoxidil amt = pure Minoxidil amt
0.02*90 + 0.07*x = 0.05*(90+x)
0.02*90 + 0.07x = 0.05*90 + 0.05*x
0.07x - 0.05x = 0.05*90 - 0.02*90
0.02x = 0.05*90 - 0.02*90 = 2.7 ====> x = = 135.
Answer. 135 mL of the 7% solution to mix.
Check. 0.02*135 + 0.07*90 = 11.25 mL of the pure minoxidil.
0.05*(90+135) = 11.25 of the pure minoxidil. ! Correct !
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