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# whatz the tens digit of N? 1) 100N = 125.253 2) N rounded to

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Manager
Joined: 15 Feb 2011
Posts: 205
whatz the tens digit of N? 1) 100N = 125.253 2) N rounded to  [#permalink]

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28 Aug 2011, 11:21
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Difficulty:

25% (medium)

Question Stats:

74% (01:02) correct 26% (01:17) wrong based on 49 sessions

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whatz the tens digit of N?

1) 100N = 125.253
2) N rounded to the nearest thousandths is 1.253
Intern
Status: pursuing a dream
Joined: 02 Jun 2011
Posts: 40
Schools: MIT Sloan (LGO)

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28 Aug 2011, 12:09
1
DeeptiM wrote:
whatz the tens digit of N?

1) 100N = 125.253
2) N rounded to the nearest thousandths is 1.253

1) N = 01.2523

Tens digit: 0. Sufficient.

2) 01.253

The fact that the thousandths are rounded is irrelevant, as the rounding happens far away from the tens digit.

Tens digit: 0. Sufficient.

Strange question. Are you sure it didn't ask for the tenths?
Manager
Joined: 15 Feb 2011
Posts: 205

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28 Aug 2011, 13:01
well what i hve state "tens"...

on second thoughts, we wldnt hve a stmt wid no reference to the ques..what if it's tenths?? wld it change the answer??
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28 Aug 2011, 13:07
DeeptiM wrote:
well what i hve state "tens"...

on second thoughts, we wldnt hve a stmt wid no reference to the ques..what if it's tenths?? wld it change the answer??

Based on the above logic. What do you think? Should it change the answer?
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28 Aug 2011, 13:28
01.253 cld have been 1.15...rounded to nearest thousandths wld hve becum 1.2...is that the rite way to think?
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Joined: 20 Dec 2010
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28 Aug 2011, 13:41
DeeptiM wrote:
01.253 cld have been 1.15...rounded to nearest thousandths wld hve becum 1.2...is that the rite way to think?

I actually didn't get that. Anyway, when it says rounded to thousandths; there must be a max of 3 digits after the decimal, that's all.

whatz the tenths digit of N?

1) 100N = 125.253
2) N rounded to the nearest thousandths is 1.253

1)
100N=125.253
N=125.253/100=1.25253
We definitely know the tenth digit because we have the entire real number with us.

N=1.25253
2 is the tenth digit.
Sufficient.

2) N rounded to the nearest thousandths is 1.253

It means, N can be:
N=1.2533464646465464644
OR
N=1.2525768768768686867876

When it says rounded to thousandths digit, we should consider only two digits: thousandth digit AND ten-thousandth digit

If N=1.2534
Here,
3 is thousandths
4 is ten-thousandths

Since, 0<=4<=5; 3 in the thousandth place remains unchanged.

If N=1.2535
Here,
3 is thousandths
5 is ten-thousandths

Since, 5<=5<=9; 3 in the thousandth place increases by 1.
N rounded to thousandths place becomes 1.254

In either case, tenths place is untouched. We shouldn't have even think about it. Tenth place will remain 2, no matter what the thousandth place is rounded to.

Thus, tenth=2. Sufficient.

Ans: "D"
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Posts: 40
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28 Aug 2011, 14:15
DeeptiM wrote:
01.253 cld have been 1.15...rounded to nearest thousandths wld hve becum 1.2...is that the rite way to think?

I'd recommend you to try to write english properly. I am not native and have problems understanding you, although it seems that fluke is having a hard time also. I think it is important not only as a matter of respect for people who has to understand you in order to help you but for yourself also; if you ever have to take the GMAT, better start practising proper grammar now.
Manager
Joined: 15 Feb 2011
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Updated on: 28 Aug 2011, 20:23
LGOdream wrote:
DeeptiM wrote:
01.253 cld have been 1.15...rounded to nearest thousandths wld hve becum 1.2...is that the rite way to think?

I'd recommend you to try to write english properly. I am not native and have problems understanding you, although it seems that fluke is having a hard time also. I think it is important not only as a matter of respect for people who has to understand you in order to help you but for yourself also; if you ever have to take the GMAT, better start practising proper grammar now.

Hi There, Thanks for your annotations, I couldnot help but smile at your verbiage

Nonetheless, I realised I have used "slangs" while reverting to the message which might have disturbed you a little. Going forward will ensure the statement is well written for the easy understanding.

Thanks.

Originally posted by DeeptiM on 28 Aug 2011, 20:15.
Last edited by DeeptiM on 28 Aug 2011, 20:23, edited 1 time in total.
Manager
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28 Aug 2011, 20:22
fluke wrote:
DeeptiM wrote:
01.253 cld have been 1.15...rounded to nearest thousandths wld hve becum 1.2...is that the rite way to think?

I actually didn't get that. Anyway, when it says rounded to thousandths; there must be a max of 3 digits after the decimal, that's all.

whatz the tenths digit of N?

1) 100N = 125.253
2) N rounded to the nearest thousandths is 1.253

1)
100N=125.253
N=125.253/100=1.25253
We definitely know the tenth digit because we have the entire real number with us.

N=1.25253
2 is the tenth digit.
Sufficient.

2) N rounded to the nearest thousandths is 1.253

It means, N can be:
N=1.2533464646465464644
OR
N=1.2525768768768686867876

When it says rounded to thousandths digit, we should consider only two digits: thousandth digit AND ten-thousandth digit

If N=1.2534
Here,
3 is thousandths
4 is ten-thousandths

Since, 0<=4<=5; 3 in the thousandth place remains unchanged.

If N=1.2535
Here,
3 is thousandths
5 is ten-thousandths

Since, 5<=5<=9; 3 in the thousandth place increases by 1.
N rounded to thousandths place becomes 1.254

In either case, tenths place is untouched. We shouldn't have even think about it. Tenth place will remain 2, no matter what the thousandth place is rounded to.

Thus, tenth=2. Sufficient.

Ans: "D"

Thank a lot Fluke..

+1 for the explanation..the way you explain is really helpful.
Thanks again!
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Re: whatz the tens digit of N? 1) 100N = 125.253 2) N rounded to  [#permalink]

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04 Jul 2018, 12:12
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Re: whatz the tens digit of N? 1) 100N = 125.253 2) N rounded to &nbs [#permalink] 04 Jul 2018, 12:12
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