The math used by oil executives or anyone else to calculate the flow of oil or some other liquid from a well with full knowledge that the numbers mean nothing, because they really have no way of knowing the real answer.
Bill: Say Jim, how much water do you think is pouring out from that fire hydrant we just hit?
Jim: Well, to me it looks like about 45 gallons per second.
Bill: How can you tell?
Jim: Oil Math