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07-06-2020
Mathematics

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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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07-06-2020

Answer:

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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