My nephew who I got into cubing sent me a question about a floppy 3x3x1. He told me it had Kangaroo Math Challenge stickers on it.
Needless to say I got curious and I ended up withfinding out it is a worldwide math challenge for kids, basically.
So.. without further ado I give you the most difficult one:http://www.mathcomp.leeds.ac.uk/pdfs/2013/pink13qp.pdf
Here are the solutions: http://www.mathcomp.leeds.ac.uk/pdfs/20 ... ng-Sol.pdf
Martywolfman and I are Skyping and we've just got question nr 10 solved and then realized you guys would likely love this too