SOLUTION: I have 60 mL of a 10% minoxidil solution. How many mL of alcohol would I need to add to the 60 mL of minoxidil to reduce the strength by 1%? 2.5%?

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Question 373837: I have 60 mL of a 10% minoxidil solution. How many mL of alcohol would I need to add to the 60 mL of minoxidil to reduce the strength by 1%? 2.5%?
Answer by josmiceli(9671) About Me  (Show Source):
You can put this solution on YOUR website!
Let x= ml of alcohol to be added
given:
ml of minoxidil in 10% solution:
.1%2A60+=+6 ml
6%2F%2860+%2B+x%29+=+.09
6+=+.09%2A%2860+%2B+x%29
6+=+5.4+%2B+.09x
.09x+=+.6
x+=+6.667
6.667 ml of alcohol need to be added
to reduce the strength by 1%
and
6%2F%2860+%2B+x%29+=+.075
6+=+.075%2A%2860+%2B+x%29
6+=+4.5+%2B+.075x
.075x+=+1.5
x+=+20
20 ml of alcohol need to be added
to reduce the strength by 2.5%