The answer to that is really simple. Forty five is a happy number, so I think that you're rude by taking off some of her, but If you want the answer, here it is:
45=9 groups of 5. take one off of those nine, and you are left with 8 groups of five. five, ten, fiftee, twenty, twenty-five, thirty, thirty-five, forty!
The answer is 40
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