Question

Average age of a group of 10 students is 12 years. If
5 new students join them, then the average age of the
group increases by 1 year. The average age of the new
students is​

Answer 1

Step-by-step explanation:

Average age of 30 students in a class = 12 years

 5 students = 10 years

Another  5 students = 14 years

remaining student= 30-5-5=20

let's assume average age of 20 student=x

Total age of all student=average age* total no of student

30∗12=5∗10+5∗14+20∗x

360=50+70+20x

360=120+20x

240=20x

x=12