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A bookseller sells Mathematics and English books…

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A bookseller sells Mathematics and English books. If 30 customers bought Mathematics books, 20 customers bought English books, and 10 customers bought the two books, how many customers has he altogether?

  • A. 60
  • B. 50
  • C. 40
  • D. 30

QUICK ANSWER…

C

SOLUTION 

A bookseller sells Mathematics and English books...

Number of people that bought Mathematics books only = number that bought Mathematics – number that bought both. = 30 – 10 = 20

Number of people that bought English books only = number that bought English – number that bought both. = 20 – 10 = 10

Therefore, the total number of customers = customers that bought Mathematics only + English only + both = 20 + 10 + 10 = 40

Now for the right answer to the above question:

  1. Option A is incorrect.
  2. Option B is incorrect.
  3. C is correct.
  4. D is not the correct answer.
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  • When resolving Venn diagrams, the number that involves all groups is firstly filled in at the middle and before other subsequent values.

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/ culled from 2018 JAMB-UTME mathematics question 30 /

A bookseller sells Mathematics and English books... » QuizTablet
A bookseller sells Mathematics and English books... » QuizTablet

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