The average of 12 numbers is 15 and the average of the first two is 14. What is the average of the rest ?
A. $15 \frac{1}{5}$ B. 14 C. $11 \frac{1}{5}$ D. 15 Answer: Option AShow Answer
Solution(By Apex Team)
Average of twelve number = 15
Sum of twelve number = 15 × 12 = 180
Average of first two number = 14
Sum of first two number = 14 × 2 = 28
Sum of first two + Sum of rest = 180
Sum of rest = 180- 28 = 152
$\begin{array}{l}\text{Average of rest}\\
=\Large\frac{152}{10}\\
=15\Large\frac{1}{5}\end{array}$
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