Question

A number is between 10 and 20. It rounds to 20. One of this number's digit is 5 greater than the other. What number is it? Explain
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Answer 1

If the number rounds to 20, it not only is between 10 and 20, but it must be at least 15. The answer is 16 because 6 is greater than 1 by an amount of 5.
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