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
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:
- Option A is incorrect.
- Option B is incorrect.
- C is correct.
- D is not the correct answer.
You may please note these/this:
- 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 /