CAT Quant Practice Problems

Question: Amol was asked to calculate the arithmetic mean of 10 positive integers, each of which had 2 digits. By mistake, he interchanged the 2 digits, say a and b, in one of these 10 integers. As a result, his answer for the arithmetic mean was 1.8 more than what it should have been. Then b – a equals
  1. 1
  2. 2
  3. 3
  4. None of these

Correct Option:2

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CAT Quant Practice Problems
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