How would i solve this engineering problem?

I need to know the height and radius of a silo. This silo is made up of two peices. A tall cylinder, and a hemisphere that have nothing between them . the Silo must be able to hold 500000 liters of water which means the total area of the hemisphere and cylinder together are 500 cubic meters. Could someone help me figure out how i would solve this and give me the answer for the height of the cylinder and radius that would give the Silo these dimensions. Thank you