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QFind the age of the teacher given that the average age of a class of 39 students is 15 years and the average increases by 3 months when the teacher's age is included.

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  • A 33 ✔ ✖
  • B 15 ✔ ✖
  • C 24 ✔ ✖
  • D 25 ✔ ✖
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Explanation


The total age of 39 students is 39 students * 15 years/student = 585 years.

The average age of 40 people (including the teacher) is 15 years 3 months = 61/4 years.

The total age of 40 people is 61/4 years/person * 40 people = 610 years.

The age of the teacher is the total age of 40 people - the total age of 39 students = 610 years - 585 years = 25 years
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