Question

9.
The average age of a class of 40 students is 15 years. When the age of the teacher is also inclue
included the
average will be increased by 1 year. The age of the teacher is (in years)
a) 41
b) 46
c) 52
d) 56
he average age of a class of 20 students is 12 years. When the age of the teacher is also included, the​

Answer 1

Answer:

D) 56 years

Step-by-step explanation:

let say teacher's age is y

x is sum of ages of all students

x/40 = 15

x = 600

(x+y)/41 = 16

x + y = 41*16

y = 41*16-600

y = 56

Answer 2

Answer:

56

Step-by-step explanation:

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