Ok, I’m going to admit this one had me working for a few minutes with a pencil. RMB’s young son had gone to his dad for help with some maths homework, and they’d blasted through it with ease except for one question, which they eventually came to me with before calling shenanigans on the whole thing and proclaiming it broken:
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In the circles above, take the numbers one through eight and arrange them so that each side of the square adds up to fifteen.
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