Answer :
The residents who read both newspapers are 3,960.
In this scenario, we can use the principle of set theory and the inclusion-exclusion principle to determine the number of residents who read both newspapers. The total number of residents is 20,000.
Given that 12,420 residents read "Town's news" and 11,540 residents read "Announcer," the sum of these two groups would be 12,420 + 11,540 = 23,960. This sum exceeds the total number of residents, indicating an overlap of readers who read both newspapers.
To find the number of residents who read both newspapers, we need to subtract the excess overlap: 23,960 - 20,000 = 3,960.
Therefore, 3,960 residents read both "Town's news" and "Announcer."
Out of 20,000 residents, 12,420 read "Town's news" and 11,540 read "Announcer."
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