Question

The average age of a class of 20 students is 12 years.

When the age of the teacher is also included the average will be decreased by 8 months.

Then the age of the teacher is ?
( In Years )

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Answer 1

answer is here ∆∆∆

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Answer 2

Answer:

26

Step-by-step explanation:

teacher age should be more than students age hence average age should increase, not decrease

Students =20

Average age =12 year

Total =20*12=240

Teacher age =N

Total age =240+N year

Total person =20+1=21

New average =(240+n)/21

Average is decreased by eight month =8/12 year =2/3 year

12-2/4=(240+n)/21

34/3=(240+n)/21

238=240+n

n= -2(negative age not possible)

correct data should be average is increased by eight months =8/12year =2/3year

12+2/3=(240+n)/21

38/3=(240+n)/21

266=240+n

n=26

teacher age is 26