The average age of a class of 35 students is 15 years. If 5 new students with an average age of 16 years are added to the class, what will be the new average age?

Explanation

Original total age:

35 × 15 = 525

New students total age:

5 × 16 = 80

New total:

525 + 80 = 605

Total students = 40.

605 / 40 = 15.125

So the new average is 15.125 years.