gabriel
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 Posted: Sun Dec 16, 2007 12:08 pm Post subject: Re: GMATprep DS |
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| sochatte wrote: | Is the hundredth digit of decimal d greater than 5?
1). The tenth digit of 10d is 7
2). The thousandth digit of d/10 is 7
could someone ecplain..... |
Let the decimal d be a.xyz .. so basically the question is, is y is greater than 5.
1.) 10d = ax.yz, the tenth digit of 10d is y and it equal to 7 which is > 5, so sufficient
2.)d/10 = 0.axyz, the thousand digit of d/10 is y and is equal to 7 which is > 5, so sufficient
Hence the answer is D |
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