Question

The mean of 2, 7, 6 and x is 15 and the mean of 18, 1, 6, x and y is 10. What is the value of y ?

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

Answer 1

Answer: (C)

$-20$

$\frac{2+7+6+x}{4}=15$

$15+x=60$

$x=45$

Now,

$\frac{18+1+6+45+y}{5}=10$

$70+y=50$

$y=-20$