The average age of 25 students in a class is 12years. If the teacher's age is included the average increases by one. What is the age of teacher's?
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Answer of the teacher's age is 38.
《Solution》
Total age of 25 students is 25 x 12 = 300
If, the teacher's age is =(@) years
Then ,
[{(25 x 12)+ @}÷13] = 26
or, (300 + @) = 338
or, (@) = 338 -300
or, (@) = 38
Answer - The teacher age is 38
《Solution》
Total age of 25 students is 25 x 12 = 300
If, the teacher's age is =(@) years
Then ,
[{(25 x 12)+ @}÷13] = 26
or, (300 + @) = 338
or, (@) = 338 -300
or, (@) = 38
Answer - The teacher age is 38
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