What is that theory called that states "the simplest solution is the answer"??

Question

It goes something like that.

Answer 1

Occam's razor (sometimes spelled Ockham's razor) is a principle attributed to the 14th-century English logician and Franciscan friar William of Ockham. The principle states that the explanation of any phenomenon should make as few assumptions as possible, eliminating, or "shaving off," those that make no difference in the observable predictions of the explanatory hypothesis or theory.

Answer 2

Ockam's Razor states that the simplest explanation is usually the correct one.

Answer 3

"all things being equal, the simplest solution tends to be the best one"

Answer 4

You might be thinking about Occam's Razor...Google it.