Question

Avrage of 11 dights is 17 if avrage of first 6 digits is 13 and average of last 6 digits is 21 then what is the 6th digit

Answer 1

Answer:

Step-by-step explanation:

Average of 11 Numbers = 17

Therefore ,

Sum of 11 numbers = 11*17 = 187

  Let the 6th number = x

Average of first 6 numbers = 13 

Sum of first 6 numbers = 6*13 = 78                                                

Average of Last 6 Numbers = 21

Sum of Last 6 Numbers = 6*21= 126

Therefore ,

Sum of first 6 numbers + sum of last 6 numbers  -  6th Number = sum of 11 numbers

     =>  78 + 126 - x  = 187

     =>  78 + 126 - 187 = x

     => 204 - 187 = x

    =>       17 = x

Hence sixth Number = 17