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 Post subject: Re: GMAT Number Theory
PostPosted: Fri May 03, 2013 8:56 am 
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I think the correct answer to this question is option E. Why can't the required number be 940 or 960 and why zero has been assumed as the units digit?


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 Post subject: Re: GMAT Number Theory
PostPosted: Fri May 03, 2013 8:58 am 
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questioner wrote:
I think the correct answer to this question is option E. Why can't the required number be 940 or 960 and why zero has been assumed as the units digit?
When we use the both statements together the required number can be any number from 934 to 966, including 940 and 960. Any one of these numbers has 9 as the hundreds digit. The question doesn't ask us to find the exact number, but just to find what its hundreds digit is. Using the both statements we are sure that this digit is 9.


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 Post subject: Re: GMAT Number Theory
PostPosted: Thu Dec 19, 2013 3:11 am 
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I did not get the concept of the question. 3R can be 1800 not just three digit number since R is multiplied by 3.


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 Post subject: Re: GMAT Number Theory
PostPosted: Thu Dec 19, 2013 3:12 am 
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questioner wrote:
3R can be 1800 not just three digit number since R is multiplied by 3.
Correct. The question statement only tells us that R is a three-digit number.
100 … 999
{100, 101, 102, 103, … 998, 999}

So 3R must be be between
300 … 2997
{300, 303, 306, 309, … 2994, 2997}


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