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JAMB Mathematics 2010 Objective — Question 12

Question 12 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2010 Objective paper, with the correct answer and a full explanation.

12. In a survey of 50 newspaper readers, 40 read Champion and 30 read Guardian, how many read both papers? A. 20 B. 15 C. 10 D. 5

A. 20Correct
B. 15
C. 10
D. 5

Explanation

n(CuG) = n(C) + n(G) - n(CnG). 50 = 40+30-x, x = 70-50 = 20.

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