Gujarati
Hindi
4.Average
easy

Find the average of first $25$ multiples of $5 .$

A

$65$

B

$60$

C

$75$

D

$80$

Solution

Sum of first $25$ multiples of $5=5(1+2+3 \ldots .25)$

$=5 \times \frac{25 \times 26}{2}=1625 \Rightarrow$ Average $=\frac{1625}{25}=65$

Standard 13
Quantitative Aptitude

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