Four, for two and two (3)

I believe the answer is:

sum

(Other definitions for sum that I've seen before include "Arithmetic calculation" , "Arithmetical problem" , "Aggregate, total" , "maths problem" , "See 25" .)

I've seen this clue in the USA Today.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.