Question 1043073
.
How many pounds of water must be added to 48 pounds of alcohol to make a solution that is 25 percent alcohol.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


<pre>
{{{48/(48+w)}}} = 0.25,

48 = 0.25*(48+w),

48 = 12 + 0.25w,

0.25w = 48 - 12,

0.25w = 36,

w = {{{36/0.25}}} = 144 pounds.

<U>Check</U>.  {{{48/(48+144)}}} = o.25.  Checked !

<U>Answer</U>. 144 pounds of water.
</pre>