Average of 12 results is 15, and average of first two is 14. average of rest?

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4.Average

easy

The average of $12$ results is $15,$ and the average of the first two is $14.$ What is the average of the rest?

A

$15.2$

B

$13.2$

C

$15$

D

$16$

Solution

Let the average of rest results $=x$

According to the question

$14 \times 2+x \times 10=15 \times 12 \Rightarrow 10 x=180-28 x=\frac{152}{10} \Rightarrow x=15.2$

Hence average of the rest is $15.2$

Standard 13

Quantitative Aptitude

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