Question 159740
{{{V = h(B[1]+B[2]+sqrt(B[1]B[2]))/3}}} where {{{h}}} is the depth of the lake, {{{B[1]}}} is the area of the bottom of the lake, and {{{B[2]}}} is the area of the surface of the lake.  The area of the bottom and the surface is given by {{{A=lw}}}, {{{180 * 20}}} and {{{216 * 24}}}.


I'll leave it to you to plug in the values and do the arithmetic.