Question

44) In class the average age of 75 students is 7 years. If
along with the class teacher, the average is 7.5
years. What is the age of teacher age?​

Answer 1

Answer:

Average age of 30 students=9

Total age of 30 students = 30 ×9=270 (1)

Average including teacher (31 person, 30 students + 1 teacher) =10

Total age including teacher=31×10=310

Age of 30 students + age of teacher =310

By(1) Replace Age of 30 students with 270

270 + Age of teacher = 310

Age of teacher =310–270=40. Ans….

Explanation:

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Answer 2

Answer:

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