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4.Average
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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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