



 
Hi Angela, There are 7.48 gallons per cubic foot and hence 5000 gallons is $\large \frac{5000}{7.48} \normalsize = 668.45 \mbox{ cubic feet.}$ Suppose the depth of oil in the tank is $d$ feet then the volume of oil in the tank is $5 \times 20 \times d \mbox{ cubic feet.}$ Thus \[5 \times 20 \times d = 668.45 \mbox{ cubic feet.}\] Solve for $d.$ Penny  


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