Question 60
The average age of 12 students is 14 years. If the age of the teacher is also included, the average becomes 15 years. What is the age of the teacher?
Solution
Given that average age of 12 students 14 years
$$\frac{sum\ of\ age\ of\ 12\ students}{12}$$=14
sum of age of 12 students=12$$\times\ $$14=168
after including teachers age the average became 15years
let the age of teacher be x
so,$$\frac{\left(x+168\right)}{13}$$=15
x+168=195
x=195-168
=>x=27
hence answer is option C
Need AI Help?
Create a FREE account and get:
- Free SSC Study Material - 18000 Questions
- 230+ SSC previous papers with solutions PDF
- 100+ SSC Online Tests for Free
