What is 7/8 of the depth of a 32 foot lake

I think the answer you are looking for is 28.
7/8 multiplied by 32 gives you 28.

32/8=4
7*4=28
You divide 32 by 8 because that gives you the value of one part of the fraction, then you times that by the number of parts you are trying to find, in this case 7, leaving you with 28 feet.