30 into 24 best min fragment found: 9
  Cut up 30 sticks of length 24 like this:
    6 x (12 + 12)
    24 x (9 + 15)
  Reassemble as 24 sticks of length 30 like this:
    12 x (15 + 15)
    12 x (9 + 9 + 12)