Posted by ANGIE on Thursday, August 23, 2012 at 7:27pm.
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  Ms. Sue, Thursday, August 23, 2012 at 7:34pm
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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