A boy was asked to calculate the arithmetic mean of ten positive integers each of which had 2 digits.
By mistake, he interchanged the two digits, a & b, in one of these ten integers. As a result, his answer for the arithmetic mean was 1.8 more than what it should have been.
Find the value of b-a.

(In reply to a short one by Mike)

Just remember the movie "Little Man Tate". The 2 digits being swapped and differing 18 is in that.

Posted by Justin on 2005-05-21 02:02:28