18 members of students average age is 12 years adding a teacher the average age is increased 1year so how much age of teacher
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Average=sum of all ages/no of members
12=sum of all ages/18
Sum of ages=12×18
Sum of ages =216
If average age is increased by 1
Then, avg=13
Total members =19
Avg=new sum /19
13×19 =new sum
New sum =247
Age of teacher =new sum - first sum
Age of teacher=247-216
Age of teacher=31
12=sum of all ages/18
Sum of ages=12×18
Sum of ages =216
If average age is increased by 1
Then, avg=13
Total members =19
Avg=new sum /19
13×19 =new sum
New sum =247
Age of teacher =new sum - first sum
Age of teacher=247-216
Age of teacher=31
lakshmi36:
okk thank you
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