Answer:
- 30 people read both newspapers,
- 70 people read only one newspaper.
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Use the principle of inclusion-exclusion.
Substitute values and find the number of Both:
- Total readers = Sum of Each - Both
- Total readers = 70 + 60 - Both
- 100 = 130 - Both
- Both = 130 - 100
- Both = 30
Find out how many read only one newspaper:
- Only one = Total - Both
- Only one = 100 - 30
- Only one = 70
So, 30 people read both newspapers, and 70 people read only one newspaper.
