Gujarati
Hindi
4.Average
medium

The average of certain first consecutive natural numbers is $20.5 .$ Find their sum.

A

$282$

B

$450$

C

$518$

D

$820$

Solution

Let the total consecutive natural number $=N$

Average of consecutive natural number

$=\frac{N+1}{2} \Rightarrow \frac{N+1}{2}=20.5 \Rightarrow N+1=41 \Rightarrow N=40$

Sum $=40 \times 20.5=820$

Standard 13
Quantitative Aptitude

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