Question

The average of the students of class is 12 years the average age of 15 if them is 10 years and the average age of the remaining is 13 years how many students are there in the class

Answer 1

Correct Answer is 24 years

Total age of 12 students = 12 * 20 = 240 and the total age of 16 students = 21*16 = 336.

Let the average age of 4 new students be x.

Therefore total age of the new students = 4x.

Hence the total age of 16 students = 240 + 4x = 336 => x = 24.