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Forty students watched films A, B and C over a week. Each student watched either only one film or all three. Thirteen students watched film A, sixteen students watched film B and nineteen students watched film C. How many students watched all three films?

Forty students watched films A, B and C over a week. Each student watched either only one film or all three. Thirteen students watched film A, sixteen students watched film B and nineteen students watched film C. How many students watched all three films? Correct Answer 8

Forty students watched films A, B and C over a week. Each student watched either only one film or all three.

Thirteen students watched film A, sixteen students watched film B and nineteen students watched film C.

Number of students who watched all three films = (13 + 16 + 19) – 40

= 48 – 40

= 8

Hence, ‘8’ is the correct answer.

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