deepa

• Jul 7th, 2005

 

27 is the answer

nmodi

• Jul 17th, 2005

 

Ans. 23 
Let x be the number of student in the class. 
16*x + 40 = 17(x+1) 
x = 40 - 17 = 23. 

Pradeep Singh MCA , 6th Sem , CUSAT

• Feb 11th, 2006

 

let the total no of students is = x ;then the sum of ages of 16 stuidents will be 16*x ; when the teachers age is included then the total ages will be = (16*x + 40)So now the average age of (x+1) = 17 )given in the question) = ( 16*x + 40 ) / (x+1)On solving this equeation we will get x = 23 So the total no of students in th class is 23 .

raviaspirant

 Profile Answers by raviaspirant 

• Sep 4th, 2010

 

Given avg=16, let no of students before = n

so sum  = 16n

after teacher's age is considered = (sum+40)/(n+1 ) = 17    (given)

equating both sums: 16n= 17(n+1) -40

n=23