Instructions

Staff employed in a UNESCO office in Paris are represented by four intersecting circles as in the given diagram. Each circle represents people who can read and write English, French, Spanish and Russian. Strength of people in each circle is also shown alongside. Study the diagram to answer the questions that follow.

Question 54

How many people know only Spanish ?

Solution

e is the set of people who only know Spanish.

e=$$\frac{1}{2}$$a

e=20

Option B


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