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The average age of a class of 40 students is 12 years. if the teacher's age is also included, the average increases by one year. Find the age of the teacher?1. 54 years2. 55 years3. 53 years4. 52 years |
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Answer» Correct Answer - Option 3 : 53 years
FORMULA USED: Average = Sum of numbers/Total numbers CALCULATION: Total age of the class (Only students) = 40 × 12 = 480 years And Total age of the class (With teacher) = 41 × 13 = 533 years Hence, Age of the teacher = 533 - 480 = 53 years |
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