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The average age of 30 students is 9 years. If the age of their teacher is included, it becomes 10 years. The age of the teacher (in years) is:

Option 1)
30
Option 2)
31
Option 3)
35
Option 4)
40
Option 5)
27

Answers (1)

best_answer

$Sum\: of \: ages = 30*9=270$
$when\: teacher\: is \: included\: then \: Sum= 31*10=310$
$Age\: o\! f \: teacher = 310-270= 40yrs$

Posted by

rishi.raj

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