Let’s assign variables for each workers
 Let x = number of boxes sorted by worker 1
 Let y = number of boxes sorted by worker 2
 Let Z = number of boxes sorted by worker 1
 => X = 3Y
 => X = 2Z
 The equation would be:
 => X + Y + Z = 66
 => X + X/3 + X/2 = 66
 => 6X + 2 X + 3 X = 396
 => 11 X = 396
 => 11X / 11 = 396 / 11
 => X = 36
 X = 36
 Y = 36 / 3 = 12
 Z = 36 / 2 = 18
 => 36 + 12 + 18 = 66