posted by Michele .
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:
Did not have any of these features?
Had exactly two of these features??
We'll be glad to check your answers.