20 into 16 best min fragment found: 6
  Cut up 20 sticks of length 16 like this:
    4 x (8 + 8)
    16 x (6 + 10)
  Reassemble as 16 sticks of length 20 like this:
    8 x (10 + 10)
    8 x (6 + 6 + 8)