Weekly Maths Problem

Henry is thinking of a secret number. He tells his sister that it is divisible by 17 and tells his brother that it is divisible by 20. If Henry is telling the truth to both of them, what is the smallest secret number that Henry could be thinking of?

You can share your answers here on Facebook or with me as I visit during the week. Remember you need to show your workings out to get the maximum points.

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