GMAT Online Course | GMAT Statistics & Number Properties Practice #8

A 700 level GMAT problem solving practice question that covers concepts in averages and number properties, specifically place value of numbers.

Question

Aaron was asked to calculate the arithmetic mean of 10 positive integers each of which had tw digits. By mistake, he interchanged the two digits, say a and b, in one of these ten integers (ab). As a result, his answer for the arithmetic mean was 2.7 more than what it should have been. Find (b – a)

In addition to discussing the solution to this question, the video also walks you through two results of adding and subtracting two digit numbers obtained by interchanging their digits. The result of the discussion will help you solve questions of this type in less than 30 seconds.

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