Question

The average of 11 results is 40 . The average of first 6 results is 44 and that of last 6 results is 36 . Find the 6 th result.

(a) 40

(b) 36

(c) 38

(d) 42

Answer 1

The sum of 11 results
$
=11 \times 40=440
$

Sum of first 6 results

$=6 \times 44=264$

Sum of last 6 results

$

=6 \times 36=216

$

$\therefore \quad$ Sixth result

$

\begin{array}{l}

=(264+216)-440 \\

=480-440=40 \text {; Ans. }

\end{array}

$

$\therefore$ Correct option $is(\mathrm{a})$