The total volume of the three cylinders is given by: V = (3) * (pi) * (r ^ 2) * (d) Where, r: cylinder radius d: cylinder depth Substituting values we have: V = (3) * (3.14) * (4 ^ 2) * (7) V = 1055.04 feet ^ 3 Answer: the volume of oil needed is: V = 1055.04 feet ^ 3