Question

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

• A. $10$
• B. $30$
• C. $20$
• D. $5$

Answer 1

Answer: (C)

$20$

Given, $\frac{2+7+6+x}{4}=5\Rightarrow 15+x=20\Rightarrow x=5$
Also, $\frac{18+1+6+x+y}{5}=10\Rightarrow 25+x+y=50\Rightarrow x+y=25\Rightarrow y=25-5=20$