Three set venn diagram
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
Determine the number of parks that:
Denote camping by C, hiking by H and picnicking by P.
Let x people had all three of that.
So, (140-x) people had only hiking and camping.
And (125-x) people had picnicking and camping.
210 people had hiking. So Number of people who had hiking and...
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