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+21 into 9 best min fragment found: 15/4
+ Cut up 21 sticks of length 9 like this:
+ 3 x (9/2 + 9/2)
+ 18 x (15/4 + 21/4)
+ Reassemble as 9 sticks of length 21 like this:
+ 3 x (21/4 + 21/4 + 21/4 + 21/4)
+ 6 x (15/4 + 15/4 + 15/4 + 9/2 + 21/4)