SOLUTION: I have a tank that measures 30 feet wide x 30 feet long x 21 feet deep. I need to fill it with water to 80 perecent of it's capacity. How many inches below the top of the tank do

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Question 621666: I have a tank that measures 30 feet wide x 30 feet long x 21 feet deep. I need to fill it with water to 80 perecent of it's capacity. How many inches below the top of the tank do I fill it to?
Thank you,
Joe Ducote
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

tank that measures 30 feet wide x 30 feet long x 21 feet deep. V = l%2Aw%2Ah

  900*21ft = 18,900  and 900*(.80*21) = 900* 16.8ft =  15,120

     21 - 16.8 = 4.2ft = 48in + 2.4in  = 50.4 inches below the top of the tank