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FDP Chapter 1, Question 11

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francesca.lanata
 Post subject: FDP Chapter 1, Question 11
 Post Posted: Tue Jun 07, 2011 5:29 pm 
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Course Students


Posts: 2
It may be a silly question, but I am a bit confused about Chapter 1 question 11 on the GMAT Strategy Guide. I understand that you are to re-write A and B using x and y digits, but why is A=10X+Y and B=10Y+X? Where does this formula come from?

Thanks!
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karan13
 Post subject: Re: FDP Chapter 1, Question 11
 Post Posted: Tue Jun 07, 2011 5:58 pm 
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Students


Posts: 27
consider any 2 digit no..... say 23 .... how will you get this value... go back to basic maths.. the tens digit is 2 and one digit is 3 that technically means that 2X10+3X1=20+3=23 .. is you consider tens place digit as x and ones place digit as y you can make a general formula 10x+y.Also note when you reverse the digits you will get 10y+x.... hope this helps.. take a few examples like 23 to figure it out ..
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francesca.lanata
 Post subject: Re: FDP Chapter 1, Question 11
 Post Posted: Tue Jun 07, 2011 6:10 pm 
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Course Students


Posts: 2
Ah, ok, I see. I thought it was a matter of plugging those values into the Q=10B-A, which now I see isn't right. Thanks!!
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jnelson0612
 Post subject: Re: FDP Chapter 1, Question 11
 Post Posted: Wed Jun 08, 2011 8:10 pm 
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ManhattanGMAT Staff


Posts: 1857
Thanks karan!

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