Question

the age of 39 students in a class 15years and if a teacher is included . the age increase by 3 months . find the age of teacher​

Answer 1

Answer:

Let the age of teacher is 'a' months.

average age of a class of 39 students is 15 years i.e. = 15 x 12 = 180 months.

Now average age of a class of 39 students plus teacher age become 180 + 3 = 183 months.

∴ 180 x 39 + a = 183 x 40

⇒ a = 300 months

⇒ Age of Teacher is 300/12 = 25 year

Step-by-step explanation:

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Answer 2

Answer

25 years

Solution

• Let the age of teacher is 'a' months.

• average age of a class of 39 students is 15 years i.e. = 15 x 12 = 180 months.

• Now average age of a class of 39 students plus teacher age become 180 + 3 = 183 months.

∴ 180 x 39 + a = 183 x 40

⇒ a = 300 months

⇒ Age of Teacher is 300/12 = 25 years