Average weight of 3 person is 65 ,kg . If a fourth person having a weight of 45 ,kg joins group, ave

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The average weight of $3$ person is $65 \,kg$. If a fourth person having a weight of $45 \,kg$ joins the group, what is the average weight of the group ? (in $kg$)

A

$65$

B

$63$

C

$61$

D

$60$

Solution

Average weight of $3$ persons $=65 kg$

Weight of $4^{th}$ person $=45 kg$

Average weight of new group $=\frac{65 \times 3+45 \times 1}{4}=\frac{195+45}{4}=\frac{240}{4}=60 kg$

Standard 13

Quantitative Aptitude

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