An engineer, physicist, and mathematician are all challenged with a problem:

An engineer, physicist, and mathematician are all challenged with a
problem: to fry an egg when there is a fire in the house. The
engineer just grabs a huge bucket of water, runs over to the fire, and
puts it out. The physicist thinks for a long while, and then measures
a precise amount of water into a container. He takes it over to the
fire, pours it on, and with the last drop the fire goes out. The
mathematician pores over pencil and paper. After a few minutes he
goes "Aha! A solution exists!" and goes back to frying the egg.

Sequel: This time they are asked simply to fry an egg (no fire). The
engineer just does it, kludging along; the physicist calculates
carefully and produces a carefully cooked egg; and the mathematician
lights a fire in the corner, and says "I have reduced it to the
previous problem."