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I've tried to show how I would work them out. It doesn't mean that those are the only way you can work them out; I'm sure there are many other ways. I apologise if something I have written doesn't make sense, it's tricky showing an explanation without being able to explain. Hopefully you all gave it a go and did your best :)

Question 1

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Question 2

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Question 3a

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Question 3b

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Question 4

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