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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****… **** **

**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.**

**QUICK TIPS…**

**You may please note the****se/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 ****201****8 ****JAMB-UTME ****mathematics ****question**** 30 ****/**

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

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