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Can you find a path from a number at the top of this network to the bottom which goes through each of the numbers $1$ to $9$ once and once only?
Woof is a big dog. Yap is a little dog. Emma has 16 dog biscuits to give to the two dogs. She gave Woof 4 more biscuits than Yap. How many biscuits did each dog get?
How many starfish could there be on the beach, and how many children, if I can see 28 arms?