SOLUTION: A pharmacist wishes to mix a solution that is 8% minoxidil. She has 70 ml of 4% solution and wishes to add some 10% solution to obtain the desired 8% solution. How much 10% should

Question 928606: A pharmacist wishes to mix a solution that is 8% minoxidil. She has 70 ml of 4% solution and wishes to add some 10% solution to obtain the desired 8% solution. How much 10% should she add?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = ml of 4% = 70
y = ml of 10%
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4x + 10y = 8(x + y)
4x + 10y = 8x + 8y
2y = 4x
y = 2x
y = 2*70
y = 140
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answer:
add 140 ml of 10%
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