Question 738203
let the numbers be x,x+1,x+2,x+3,x+4,x+5

Total = 6x+15

numbers = 6

average = 9.5 = (6x+15)/6

multiply by 6
57=6x+15
-15
42=6x
/6
x=7

the numbers are 7,8,9,10,11,12

10+11+12=33

33/3=11

average of last three numbers is 11