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25 December, 08:18

The sum of the two digits of a certain two-digit number equals the square root of the number? What is the number?

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  1. 25 December, 12:04
    0
    81

    Step-by-step explanation:

    2-digit squares are 16, 25, 36, 49, 64, 81.

    Their sums of digits, are ...

    7, 7, 9, 13, 10, 9

    The square 81 has a sum of digits equal to its square root.
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