Question

Average age of 18 students is 12 years 9months. 2 new students come and average age becomes 12 years 6months. If age of one of them is 11 years 6 months then find the age of others one

Answer 1

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

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Answer By shreyas