In a survey of 100 resorts, it was found that
28 had a spa.
44 had a children's club.
11 had a spa and children's club.
9 had all three features.
Complete parts a) through e).
59 had a fitness center.
16 had a spa and a fitness center.
21 had a fitness center and children's club.
a) How many of the resorts surveyed had only a spa?
(Type a whole number.)