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
Answers
Answered by
8
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
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