The average age of a class of 40 students is 18 years. When the teachers age is also included to calculate the average age becomes 19 years. What is the teacher's aqe? .
Answers
Answered by
1
Answer:59 yrs
Step-by-step explanation:avg age of 41 people including the teacher x no. Of heads = 779
Avg age of stds x no. of stds = 720
Subtract 779 -720 = 59 yrs
Answered by
1
Answer:
Step-by-step explanation:
Let the sum of all ages be x
Average age= sum of all ages/total number of students
18=x/40
18*40=x
720=x
Sum of all ages is 720.
Now let the teacher’s age be y
Average age after teacher’s age is 19
Total no of people=40+1
=41
Therefore,
19=720+y/41
19*41=720+y
779=720+y
779-720=y
59=y
The teacher’s age is 59.
Step-by-step explanation:
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