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MATH

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ROBERT NUMBER IS BETWEEN 20 AND 32. THE SUM DIGITS IS 10. WHAT IS ROBERT NUMBER? I KNOW ANSWER IS 28 BUT NEED TO KNOW STEP BY STEP HOW TO GET TO 28?

  • MATH -

    Only one of these numbers has digits that add up to 10.

    21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31

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