The average age of 28 students of a class is 40 years. If the age of the teacher is also included, the average age of the whole group becomes 41 years. The age (in years) of the teacher is:
Given:
Number of students = 28
Average age of students = 40 years
Average age including teacher = 41 years
Total persons including teacher = 29
Formula Used:
Total Age = Average × Number of persons
Solution:
Total age of 28 students = 28 × 40 = 1120 years
Total age of students and teacher = 29 × 41 = 1189 years
Age of the teacher = 1189 − 1120 = 69 years
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60 Mins English English20 Questions40 Marks12 Mins English English80 Questions160 Marks60 Mins EnglishIf 5 times a son's age is added to his father's age, the sum is 42 years. If 2.8 times the father's age is added to the son's age, the sum is 76 years. What is the father's age (in years)?
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