SOLUTION: In preparing 250 ml of an alcohol solution in water, a pharmacist used 4 ml of alcohol. What was the percentage of alcohol in the water solution? I know the answer is 1.6 mg 1.6

Question 681962: In preparing 250 ml of an alcohol solution in water, a pharmacist used 4 ml of alcohol. What was the percentage of alcohol in the water solution?
I know the answer is 1.6 mg 1.6% because my study guide says so but looking at their solution I am confused....
4mL alcohol/250mL solution x 100mL solution = 1.6mg = 1.6%
Is there anyway you can explain what was done here or even a simplier way to the answer.
Found 2 solutions by stanbon, ReadingBoosters:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
In preparing 250 ml of an alcohol solution in water, a pharmacist used 4 ml of alcohol. What was the percentage of alcohol in the water solution?
I know the answer is 1.6 mg 1.6% because my study guide says so but looking at their solution I am confused....
4mL alcohol/250mL solution x 100mL solution = 1.6mg = 1.6%
Is there anyway you can explain what was done here or even a simplier way to the answer.
------
Solve x/100 = 4/250
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x = 100(4/250) = 400/250 = 1.6
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Ans: 1.6%
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Cheers,
Stan H.
Answer by ReadingBoosters(3246) (Show Source): You can put this solution on YOUR website!
Out of 250ml solution, 4ml is alcohol; hence, the fraction
...
= .016
...
For percent, multiply by 100
.016 * 100 = 1.6% alcohol
...
-Reading Boosters
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