Question 940065
The average of 21 number is 30
 sum  = average * no of numbers
     = 30 * 21
     = 630
if we remove largest number 50 , then remaining sum  =  630-50
                                         =580
now  we have only 20 numbers
 average  = {{{ 580/20}}}
          =  29
 Result : average  = 29