Question 973484
Let y be the depth of the  pool.



Pool Capacity
{{{25*11*y=261y*ft^3}}}


Water Volume
{{{25*11*4=110*ft^3}}}


Empty Volume still to be filled,  {{{(261y-110)*ft^3}}}.
As gallons unit,
{{{highlight((261y-110)*(7.5/3))}}}


Still a variable expression because not enough information given to find volume capacity or height of the pool dimension.