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In the decimal representation of x, where 0 < x < 1, [#permalink]

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13 Nov 2008, 09:45

In the decimal representation of x, where 0 < x < 1, is the tenths digit of x nonzero? (1) 16x is an integer. (2) 8x is an integer.

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From stmt2: 0.099999999999 * 8 = .79 < 1 , so tenth's digit can't be zero stmt1: x could be .0625 or .75

IMO B Live stronger didn't really understand your approach

this is how i did it

1) 16x=I => possible values of x=1/16,2/16,3/16,.....15/16=.0625,.125 and so on hence tenth digit can be 0 or can t be 0 hence insuff 2) 8x=I => x=1/8,2/8,3/8 and so on or x= 0.125,0.25 and so on hence 10th place can never be 0 hence sufficient

D. if result is an integer, then decimal part must be .000 (1) if 16X is an integer, the tens digit has to be 2 or 7 and units digit 5.--sufficient (2)if 8X is an integer, the tens digit again has to be 2 or 7 and units digit 5.--sufficient

my mistake.... din realise tenth is 1st digit after decimal....B is correct

prasun84 wrote:

D. if result is an integer, then decimal part must be .000 (1) if 16X is an integer, the tens digit has to be 2 or 7 and units digit 5.--sufficient (2)if 8X is an integer, the tens digit again has to be 2 or 7 and units digit 5.--sufficient

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gmatclubot

Re: GMAT Set 29 -32
[#permalink]
13 Nov 2008, 11:38