Question

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?
A. 37.5 years
B. 45 years
C. 42 years
D. 39 years
>
an​

Answer 1

Answer:

B

Step-by-step explanation:

Total age of students =75× 7

Total age of teacher + students =76×7.5

age of teacher = 76×7.5 - 7×75 =45