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If the mean o...

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If the mean of 9 numbers is 45 , then find the sum of all numbers.

A

305

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B

405

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C

505

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D

605

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Solution

The correct option is B 405
$A v e r a g e = \frac{S u m o f a l l q u a n t i t i e s}{T o t a l n u m b e r o f q u a n t i t i e s}$
45 = $\frac{S u m o f a l l n u m b e r s}{9}$
$∴$ Sum of all numbers = 45 $\times$ 9 = 405.

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