The average of eight numbers is 56 . Three numbers are 49,57 and 72 , then find the average of remaining 5 numbers.
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The average of eight numbers is 56 . Three numbers are 49,57 and 72 , then find the average of remaining 5 numbers.
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Solution

 Sum of 8 numbers

$=8 \times 56=448$

Sum of 3 numbers

$=49+57+72=178$

Sum of remaining 5 numbers

$=448-178=270$

$\therefore \quad$ Average of 5 numbers

$=\frac{270}{5}=54$; Ans.

$\therefore \quad$ True option $=(b)$

Trick : Required Average

$$

\begin{array}{l}

=\frac{(8 \times 56)-(49+57+72)}{5} \\

=54 ; \text { Ans. }

\end{array}

$$

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