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What is the tens digit of the three-digit positive integer n

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What is the tens digit of the three-digit positive integer n  [#permalink]

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New post 29 Jan 2019, 02:59
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What is the tens digit of the three-digit positive integer n?

(1) The tens digit of (n+5) is 5.

(2) The tens digit of n is less than the tens digit of 10n

Posted from my mobile device

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What is the tens digit of the three-digit positive integer n  [#permalink]

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New post Updated on: 29 Jan 2019, 03:44
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rashedBhai wrote:
What is the tens digit of the three-digit positive integer n?

(1) The tens digit of (n+5) is 5.

(2) The tens digit of n is less than the tens digit of 10n

Posted from my mobile device


Question: What is the tens digit of the three-digit positive integer n?

Statement 1: The tens digit of (n+5) is 5.

by adding 5 in any number the ten's digit may change (if unit digit is greater than 4) or may remain same (if unit digit of number is less than 5) hence, the ten's digit of n may be 5 or 4 based on unit digit

since we have multiple values hence

NOT SUFFICIENT

Statement 2: The tens digit of n is less than the tens digit of 10n

i.e. ten's digit of n is less than the unit digit of n (because by multiplying 10 in the number, the unit digit of number shifts to the tens place of result)

NOT SUFFICIENT

Combining the two statements

ten's digit of n (which may be either 4 or 5) is less than unit's digit of n
i.e. unit digit of n is may vary from 5 to 9
in every case, adding 5 in n will change the ten's digit of number which becomes 5 after addition of 5 in n hence
ten's digit of n = 5-1 = 4

SUFFICIENT

Answer: Option C
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Originally posted by GMATinsight on 29 Jan 2019, 03:12.
Last edited by GMATinsight on 29 Jan 2019, 03:44, edited 1 time in total.
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What is the tens digit of the three-digit positive integer n  [#permalink]

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New post Updated on: 29 Jan 2019, 03:32
rashedBhai wrote:
What is the tens digit of the three-digit positive integer n?

(1) The tens digit of (n+5) is 5.

(2) The tens digit of n is less than the tens digit of 10n

Posted from my mobile device



from the given info
we know n= 100a+10b+c
3 digit no
#1
tens digit n+5 is 5
so n can be 145,146,147,148,149 ; addition of 5 would given tens digit as 5
also when 150,151,152,153,154 ; addition of 5 would given tens digit as 5
in sufficient

#2
tens digit of n < 10n , tens digit
not sufficient

from 1& 2
we can say that value of n would be from 145-149 and tens digit would be 4 ...
IMO C sufficient
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Originally posted by Archit3110 on 29 Jan 2019, 03:29.
Last edited by Archit3110 on 29 Jan 2019, 03:32, edited 1 time in total.
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What is the tens digit of the three-digit positive integer n  [#permalink]

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New post 29 Jan 2019, 03:31
GMATinsight wrote:
rashedBhai wrote:
What is the tens digit of the three-digit positive integer n?

(1) The tens digit of (n+5) is 5.

(2) The tens digit of n is less than the tens digit of 10n

Posted from my mobile device


Question: What is the tens digit of the three-digit positive integer n?

Statement 1: The tens digit of (n+5) is 5.

by adding 5 in any number the ten's digit may change (if unit digit is greater than 4) or may remain same (if unit digit of number is less than 5) hence, the ten's digit of n may be 5 or 4 based on unit digit

since we have multiple values hence

NOT SUFFICIENT

Statement 2: The tens digit of n is less than the tens digit of 10n

i.e. ten's digit of n is less than the unit digit of n (because by multiplying 10 in the number, the unit digit of number shifts to the tens place of result)

NOT SUFFICIENT

Combining the two statements

ten's digit of n (which may be either 4 or 5) is less than unit's digit of n
i.e. unit digit of n is may vary from 1 to 4
in every case, adding 5 in n will NOT change the ten's digit of number hence
ten's digit of n = 5

SUFFICIENT

Answer: Option C

GMATinsight:
sir , quoting your line :
ten's digit of n (which may be either 4 or 5) is less than unit's digit of n
i.e. unit digit of n is may vary from 1 to 4
in every case, adding 5 in n will NOT change the ten's digit of number hence
ten's digit of n = 5


wont the value of n be in range from 145-149 ; tens digit would be 4..
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Re: What is the tens digit of the three-digit positive integer n  [#permalink]

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New post 29 Jan 2019, 03:45
Archit3110 wrote:
GMATinsight wrote:
rashedBhai wrote:
What is the tens digit of the three-digit positive integer n?

(1) The tens digit of (n+5) is 5.

(2) The tens digit of n is less than the tens digit of 10n

Posted from my mobile device


Question: What is the tens digit of the three-digit positive integer n?

Statement 1: The tens digit of (n+5) is 5.

by adding 5 in any number the ten's digit may change (if unit digit is greater than 4) or may remain same (if unit digit of number is less than 5) hence, the ten's digit of n may be 5 or 4 based on unit digit

since we have multiple values hence

NOT SUFFICIENT

Statement 2: The tens digit of n is less than the tens digit of 10n

i.e. ten's digit of n is less than the unit digit of n (because by multiplying 10 in the number, the unit digit of number shifts to the tens place of result)

NOT SUFFICIENT

Combining the two statements

ten's digit of n (which may be either 4 or 5) is less than unit's digit of n
i.e. unit digit of n is may vary from 1 to 4
in every case, adding 5 in n will NOT change the ten's digit of number hence
ten's digit of n = 5

SUFFICIENT

Answer: Option C

GMATinsight:
sir , quoting your line :
ten's digit of n (which may be either 4 or 5) is less than unit's digit of n
i.e. unit digit of n is may vary from 1 to 4
in every case, adding 5 in n will NOT change the ten's digit of number hence
ten's digit of n = 5


wont the value of n be in range from 145-149 ; tens digit would be 4..



Archit3110

You are right... made silly error... I have made the correction now... :)

Thank you
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Re: What is the tens digit of the three-digit positive integer n   [#permalink] 29 Jan 2019, 03:45
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