Sleep, routine and daylight: it's a simple formula, and easy to take for granted.
Smithsonian mag (2018)
The formula is simple - eat less, exercise more.
Times, Sunday Times (2009)
The show's formula is simple but brilliant.
Times, Sunday Times (2014)
Definition of 'formula'
formula
(fɔːʳmjʊlə) (fɔːʳmjʊliː)Explore 'formula' in the dictionary
singular noun
A formula for a particular situation, usually a good one, is a course of action or a combination of actions that is certain or likely to result in that situation.
Definition of 'simple'
simple
(sɪmpəl)Explore 'simple' in the dictionary
adjective
If you describe something as simple, you mean that it is not complicated, and is therefore easy to understand.