( X 10) + ( X 1) = 22 chewing-gums
( X 10) + ( X 1) = 33 chewing-gums
( X 10) + ( X 1) = 25 chewing-gums
( X 10) + ( X 1) = 52 chewing-gums
( X 10) + ( X 1) = 63 chewing-gums
( X 10) + ( X 1) = 36 chewing-gums