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Andy and Mr Morris' Maths Group sent in a very comprehensive solution to this challenge, thank you all! Here is the image for the first part of the problem:
Here are the group's responses:
What great reasoning all of you! I'm also intrigued to know whether you can explain why your divisibility test for 7 works...
Here is the second image in the problem:
Here are the group's solutions for the second part of the task:
Thank you to you all!