The plant manager is considering the installation of a second tank into an existing containment dike with a capacity of 175,000 gallons. (Note: 1 U.S. gallon = 0.1337 cubic feet). The existing tank in the containment measures 15 feet in diameter and 12 feet in height. The second tank being planned measures 20 feet in diameter and 40 feet in height. State law requires that the dike hold at least 125% of total container capacity. Therefore, you must total all containers in the containment.

I can't figure out the equation for this. Everything I try is WRONG.