Question 1174317
.


It is very simple problem.


<pre>
According to the condition, you write this equation


    20 = {{{sqrt(32H)}}}.


Your unknown is the variable H.


To find it, you square both sides of this equation


    20^2 = 32H,

or

    400 = 32h.


As a final step, you find H = {{{400/32}}} = 12.5.


<U>ANSWER</U>.  The depth is 12.5 feet.
</pre>

Solved.