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The Magic Number and the Hepta-tree

Find the exact difference between the largest ball and the smallest ball on the Hepta Tree and then use this to work out the MAGIC NUMBER!

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Shedding Some Light

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What's My Weight?

Stage: 2 Short Challenge Level: Challenge Level:1
Which weighs most - the apple or the weights?
How many weights are there? So what is a quarter of that?
If the weights have to be heavier than a quarter of the apple what do you think is a likely weight for them to be?