Question

the average age of class of 39 students is 15 years.if the teacher age be included,then the average increases by 1 year.find the age of teacher.​

Answer 1

Answer:

55 yrs

Step-by-step explanation:

Average age = Sum of all ages / Number of people

Let the sum of all ages of 39 students be "x"

Then,

15 yrs = x/39

x = 39 × 15 yrs

x = 585 yrs

If age of teacher is "y" then from the formula

16 yrs = (x + y)/40

x + y = 640 yrs

y = 640 yrs - x

y = 640 yrs - 585 yrs

y = 55 yrs