In a survey of 1200 people about newspaper reading: 500 read paper A, 400 read paper B, and 300 read paper C. Of these, 120 read both A and B, 90 read both B and C, 100 read both A and C, and 40 read all three papers. How many people read only paper A?

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Accepted Answer

320. Only A = 500 - 120 - 100 + 40 = 320 (subtract both overlaps, add back the triple counted twice).

In a survey of 1200 people about newspaper reading: 500 read paper A, 400 read paper B, and 300 read paper C. Of these, 120 read both A and B, 90 read both B and C, 100 read both A and C, and 40 read all three papers. How many people read only paper A?

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