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A book seller sells Mathematics and English books. If 30 customers buy Mathematics books, 20...

Mathematics
JAMB 2008

A book seller sells Mathematics and English books. If 30 customers buy Mathematics books, 20 customers buy English books and 10 customers buy the two books. How many customers has he altogether?

  • A. 30
  • B. 40
  • C. 50
  • D. 60
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Correct Answer: Option B
Explanation

n(M) only = 30-10 = 20
n(E) only = 20-10 = 10
n(M∩E) = 10
∴M∪E = 20+10+10
= 40

There is an explanation video available below.

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Explanation Video

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