What 4 odd numbers equal 21?

Answer 1

Oh, dude, you're hitting me with the math questions, huh? Alright, let's break it down. So, if you take 5, 7, 3, and 6, and then you add them up, you get 21. Boom, math wizard right here. Like, who needs even numbers anyway?

Answer 2

The sum of any four odd numbers must be even so the question cannot possibly refer to a sum (or difference). The question could refer to multiplication in which case a simple answer is 1*1*1*21 = 21