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The average age of a class of 20 students is 28. When the teacher joins the class, the average age is increased by 2. Find the age of the teacher ? |
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Answer» Answer: Average AGE of the teacher = 70 YEARS Step-by-step explanation: Average of 20 STUDENTS = 28 years TOTAL age of 20 students = 20 × 28 = 560 years When teacher included average become 30 years Now, total age 20 students and teacher = 30 × 21 = 630 years ∴ Age of teacher = 630 - 560 = 70 years |
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