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Re: If the tens digit x and the units digit y of a positive [#permalink]

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18 Jun 2014, 03:37

Hello from the GMAT Club BumpBot!

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Re: If the tens digit x and the units digit y of a positive [#permalink]

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06 Aug 2014, 10:28

Bunuel!!!! Your solutions make us all speechless. You are like the "Salman Khan" (The Hedge fund analyst who is the founder of Khan Academy- Free & quality education for all) of Gmat club. And what makes you even more special is that your solutions effectively convey what a hundred videos do, without any audio voice-overs.

Re: If the tens digit x and the units digit y of a positive [#permalink]

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11 May 2016, 03:30

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: If the tens digit x and the units digit y of a positive [#permalink]

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24 Nov 2016, 00:37

NOTE=> This Question Should have specified that n is a two digit positive integer. Nevertheless let us proceed => N=xy=> 10x+y (x,y are tens and units digit) N'=yx=10y+x hence N'=N+9 => 9y-9x=9 y=1+x

Re: If the tens digit x and the units digit y of a positive [#permalink]

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01 Dec 2016, 09:55

Shouldnt this question specify that they want y in terms of x of the starting number? take 23 and 32. y=x+1 works for 23 but not for 32. Confusing question?..

Shouldnt this question specify that they want y in terms of x of the starting number? take 23 and 32. y=x+1 works for 23 but not for 32. Confusing question?..

No, the question is clear.

\(n=10x+y\) and \(n'=10y+x\) --> \(n'-n=(10y+x)-(10x+y)=9\) --> \(y=x+1\).
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