The average of 2, 7, 6 and x is 5 and the average of 18, 1, 6, x and y is 10. What is the value of y ? · ABC26GN1541

Subject: General Aptitude · Chapter: Average

The average of 2, 7, 6 and $x$ is 5 and the average of 18, 1, 6, $x$ and $y$ is 10. What is the value of $y$ ?

(a)5

(b)10

(c)20

(d)30

Answer

Answer (as printed): C

Explanation

We have : $\left(\frac{2+7+6+x}{4}\right)=5$ or $15+x=20$ or $\quad x=5$. Also, $\left(\frac{18+1+6+x+y}{5}\right)=10$ or $25+5+y=50$ or $y=20$.

Explanation as extracted from the printed page; notation may be imperfect.

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