There are nine three-digits numbers with distinct units
digits. Each number is reversed and the reversed
number is subtracted from the original number. The
results were found to have an average of 0. If for each
number, the hundreds digit is not less than its units
digit, find the average of the hundreds digits of the
greatest and the least numbers.
(A) 4 (B) 5 (C) 6 (D) 7
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option (D) 7 is the correct answer
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