Question

check my answers to see if they are right....
A survey was taken to determine where students study. Of the 110 surveyed 67 studied in the cafeteria 61 studied in the student union, 24 studied in both
A.Of those interviewed how many studied only in the cafeteria 43??
B.Of those interviewed how many studied only in the student union 37??
C.Of those interviewed how many did not study in either 30??