Question

67. The average age of 20 students is
18 years. If the average age of 5
students is 12 years, then ſind the
average age of remaining students.
(a) 18 years at (b) 20 ycars
(c) 19 years old (d) 17 years
​

Answer 1

Answer:

The total age of the 30 students = 30*12 = 360 years.

The total of the first 5 students = 5*10 = 50 years.

The total of the next 5 students = 5*14 = 70 years.

So the total of the remaining 30–5–5 or 20 students = 360–50–70 = 240 years.

Or the average age of the remaining 20 students = 240/20 = 12 years. Answer.