Answer
$\%~alcohol=25\%$
$\%~water=75\%$
Work Step by Step
We know that:
$alcohol+water=36$ oz
And that:
$alcohol=9$ oz
To find the percent alcohol, we use:
$\%~alcohol=\frac{alcohol}{alcohol+water}=\frac{9}{36}=0.25=25\%$
That means that the percent water is:
$\% water+\% alcohol=100$
$\% water=100-\% alcohol=100-25=75\%$
