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The average age of a class of 22 - students is 21 years. The average Y age increases by 1 year when the teacher's age is also included. What is the age of the teacher ?

A48 years

B45 years

C43 years

D44 years

Answer:

D. 44 years

Read Explanation:

Total age of 22 students = 22 x 21 = 462 years Total age after including the teacher's age = 23 x 22 = 506 years The age of the teacher = 506 - 462 = 44 years


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