I think it's 27 but I may be wrong.
yeah 27 because you do the butterfly method. you multiply 63 and 12 you get 756 then you divide 756 by 28 and you get 27
Answer:
x = 27
Step-by-step explanation:
let the donominatir be x
28/63 = 12/x
28x = 756
x = 756/28
-TheUnknownScientist
