1. What is the average age of children in the class? I. The age of the teacher is as many years as the number of children. II. Average age is increased by 1 year if the teacher's age is also included.

Ask Your Doubts Here

Comments

By: guest on 01 Jun 2017 05.44 pm

Let there be x children. I gives, age of teacher = x years. II gives, average age of (x + 1) persons = (x + 1) years. Teacher's age = (x + 1) (x + 1) - x2 = (x2 + 1 + 2x) - x2 = (1 + 2x) Thus, teacher's age cannot be obtained. Correct answer is (D)