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The mean monthly salary of 12 teacher in a school is rupees 15000. Teacher retire from the school who get rupees 25000 per month what will be the mean monthly salary now

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by musssu

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by musssu

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15000*12=180000

180000-25000=155000

mean=155000*11/11

=1705000/11

=155000

180000-25000=155000

mean=155000*11/11

=1705000/11

=155000

x/12= 15000.....(i)

and now when 1 teacher is retired then salary of 11 teachers is x-25000....(ii)

so, from (i) x=12*15000

x=180000

now put x=180000 in eq..(ii)

180000-25000=155000

so now new mean salary is

155000/11=14090.90