Use Venn diagrams and set concepts to solve application problem In a survey of 90 resorts, it was found that
26 had a spa.
50 had a fitness center.
40 had a children's club.
12 had a spa and a fitness center.
9 had a spa and children's club.
17 had a fitness center and children's club.
7 had all three features.

a) How many of the resorts surveyed had only a spa?
nothing
b) How many of the resorts surveyed had exactly one of these features?
nothing
c) How many of the resorts surveyed had at least one of these features?
nothing
d) How many of the resorts surveyed had exactly two of these features?
nothing
e) How many of the resorts surveyed had none of these features?
nothing