Question

3. The average age of 50 students of a class is 13.5 years. The average age along with
their teacher is 14 years. What is the age of their teacher?
(1) 36 years
(2) 37.5 years (3) 39 years
(4) 38 years​

Answer 1

Answer:

39 years

Step-by-step explanation:

Total age of Students alone (Students) = 50 * 13.5 = 675

Total age including teacher (Students + Teacher) = 51 * 14 = 714

Teacher age(( students+ teacher) - (Students)) = 714 - 675 = 39 years

(or)

50 * 0.5 + 14 = 39

If average increased by 0.5.. it distribute average among students (50 * 0.5) to make everything to average 14. teacher average 14