Question

out of 8 Student the average age of the first 5 is 12 years and last 2is 10 year's. find the average age of 8 Student​

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