# College Algebra - Union of Sets

A survey of 300 parks showed the following.

• 15 had only camping.

• 20 had only hiking trails.

• 35 had only picnicking.

• 185 had camping.

• 140 had camping and hiking trails.

• 125 had camping and picnicking.

• 210 had hiking trails.

Find the number of parks that

• a)had at least one of these features.

• b)had all three features.

• c)did not have any of these features.

• d)had exactly two of these features.