A deceptively simple puzzle. Fill in the grid.
Maths knowledge required: Very basic – calculating means.
The solution will be available next week.
The giant crab that I have chosen to illustrate this post is not relevant to the puzzle, but bonus points go to anyone who knows why I have picked it and can provide an appropriate response…
* – Not too taxing
** – Requires significant thought
*** – Extremely difficult
!!!! – Requires high level mathematics / Unsolved / Insoluble