Oil Tank
Source:
February 11, 2009
geometryrectangle
Problem Statement
A cylindrical oil tank, lying horizontally, has an interior length of feet and an interior diameter of feet. If the rectangular surface of the oil has an area of square feet, the depth of the oil is:
(A)\ \sqrt{5} \qquad
(B)\ 2\sqrt{5} \qquad
(C)\ 3\minus{}\sqrt{5} \qquad
(D)\ 3\plus{}\sqrt{5} \\
(E)\ \text{either }3\minus{}\sqrt{5}\text{ or }3\plus{}\sqrt{5}