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Re: If the unit digit of the positive integer n is [#permalink]

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10 Aug 2016, 12:13

it is given that unit digit is 5 so No. can be 5, 15, 65,75or 85 .i.e anything that unit digit is 5 1st stmt- N+5=tenth digit is 7 so only two digit integer if n=65 +5=70 ( tenth digit is 7) while 75+5=80 so it confirm that 65 is that No. 2nd Stmt If 6 is reduced from N that tenth digit will be 5 here also 65-6=59( tenth digit is 5)

If the unit digit of the positive integer n is [#permalink]

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10 Aug 2016, 12:24

shravan2025 wrote:

it is given that unit digit is 5 so No. can be 5, 15, 65,75or 85 .i.e anything that unit digit is 5 1st stmt- N+5=tenth digit is 7 so only two digit integer if n=65 +5=70 ( tenth digit is 7) while 75+5=80 so it confirm that 65 is that No. 2nd Stmt If 6 is reduced from N that tenth digit will be 5 here also 65-6=59( tenth digit is 5)

so its D

Good one...Tried in the same way..

Here the number is 65 and its tens digits is 6 and units 5..... In GMAT if stat 1 and stat 2 individually sufficient means ..we get same result from both.

There is 1 variable (the tens digit of n) in the original condition. In order to match the number of variables and the number of equations, we need 1 equation. Since con 1) and con 2) each has 1 equation, there is a high chance that D is the correct answer. In case of con 1), the tens digit is always 6. The answer is unique and the condition is sufficient. In case of con 2), the tens digit is always 6 as well. The answer is unique and the condition is sufficient. Hence, the correct answer is D.

Re: If the unit digit of the positive integer n is [#permalink]

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30 Sep 2017, 01:19

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