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Arrange the numbers 1 to 20 onto the rose petals using these rules :

  • Yellow petals contain odd numbers, white petals contain even numbers.
  • The outer petals are the difference or addition of the inner petals.
  • some numbers have been there as guide.

Example
enter image description here

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enter image description here

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  • $\begingroup$ Looks interesting. For future solvers, note that only the colours of the petal on one layer are necessary. $\endgroup$
    – boboquack
    Commented Dec 6, 2017 at 9:29

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I think the answer is unique, but there is my solution :

enter image description here

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