SOLUTION: Average age of 30 students in a class is 10. then 1 more is took admission in that class. now the average of their age is 11. then find the age of last one?

Question 815517: Average age of 30 students in a class is 10. then 1 more is took admission in that class. now the average of their age is 11. then find the age of last one?

Answer by balthazar612(14) (Show Source): You can put this solution on YOUR website!
To solve this we know that,
Average of age= total ages of students/ total Students
10 = total ages of students/30
10*30= total ages of students
300= Total ages of students

Now
When 1 student is added there will be total 11 students using above formula
Average of age= Total ages of students/ total ages of students
11 = total ages of students/ 31
Total ages of students= 31*11
= 341
Change in total age= 341 - 300

Age of 11th student= 41
Answer= 41
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