Posted by **carol ** on Saturday, January 19, 2013 at 7:14pm.

A survey of 500 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

Determine the number of parks that had at least one of the features

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