<PRE><B>Question 963390</B>
3000 cubic inches of volume is  {{{2/3-1/4}}} of tank volume.


{{{20*20*L=3000}}}, using L for the length portion that corresponds to the 3000 inch^3 difference.  The length along the rectangular tank directly corresponds to volume.


{{{2/3-1/4}}}
{{{8/12-3/12}}}
{{{5/12}}}


L is {{{5/12}}} of the whole length of the rectangular tank.
{{{L=3000/(20*20)}}}
{{{L=30/4}}}
{{{L=15/2}}}, inches.


With no further explanation,
{{{3000(12/5)}}}
{{{600*12}}}
{{{highlight(7200*inch^3)}}}, tank capacity</PRE>