A mathematician, a physicist and an engineer are tasked with finding the volume of a rubber ball

Answer: A physicist, engineer, and mathematician are in burning buildings.

The physicist calculates how much water he needs to put the fire out, gets that much water, and puts it out.

The engineer calculates how much water he needs to put the fire out, gets ten times that much water, and puts it out.

The mathematician calculates how much water he needs to put the fire out, exclaims ‘there is a solution’, and burns to death.