CDS 2013 PYQ with Answer — In a class of 110 students, x students take both Mathematics and Stat… | UPSC One

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CDS 2013 · Elementary Mathematics (CDS-II)Q12

Back to the full 2013 paper

2013 · Q12

In a class of 110 students, x students take both Mathematics and Statistics, 2x+20 take Mathematics and 2x+30 take Statistics. There are no students who take neither. What is x equal to?

Elementary MathematicsSets

A15
B20
C25
D30

Explanation

(2x+20)+(2x+30)−x=110→x=20. Answer B.

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