The average age of a graph of 9 students is 2 | vedclass

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Question

Average age of new student $=$

$\frac{Old\, Number \,of \,student \,	imes \,Old\, average \,of \,students \,- \,New \,average \,	imes \,New \,num

Vedclass · Accepted Answer

$15$

Vedclass · Answer

Average age of new student $=$

$\frac{Old\, Number \,of \,student \,	imes \,Old\, average \,of \,students \,- \,New \,average \,	imes \,New \,number\, of \,students}{Number \,of \,New \,students}$

$=\frac{9 	imes 20-18 	imes 15}{6}=\frac{180-270}{6}=\frac{90}{6}=15$ years

The average age of a graph of $9$ students is $20\, years.$ When $6$ more students joined the group, the average age falls by $2\, years.$ Then the average age of new students is

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