The average age of 19 boys in a class is 21 years. If the teacher's age is included, the average increases to 22 years. What is the teacher's age? `A. 39 years` `B. 41 years` `C. 40 years` `D. 44 years`

Options

A. 39 years/39 वर्ष
B. 41 years/ 41 वर्ष
C. 40 years/ 40वर्ष
D. 44 years/ वर्ष

Answer

B

Explanation

19 लड़कों की औसत आयु `= 19 xx 21 = 399`
अध्यापक की आयु जोड़ने के बाद की औसत आयु `= 20 xx 22 = 440`
अध्यापक की आयु =440-339=41