Think of a number

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Think of a number. Subtract 13 from this number to get the first result. Go back to the original number and subtract 5 to get the second result. Multiply the first and second results together to get the final answer.


Savan follows Mrs Catchpole’s instructions starting with the number 23. Work out Savan’s final answer


Richard obtains a final answer of 0. What number might he have thought of? Give all possibilities

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