Question 967610
    Let x represent the number
 The three consecutive numbers are x, x+1,x+2
    There sum
  x + x + 1 + x + 2 = 66
    Re-arrange 
  x + x + x + 1 + 2 = 66
   3x + 3 = 66
   3x = 66 - 3
   3x = 60
 Divide both sides by 3
   x = 60/3
   x = 20
Since represent the smallest number, the smallest number is 20