Is rs=rx-2 ?

Is rs=rx-2 ?

a) r is an odd number

b) x=s+2

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Take GMAT Team tagged this post with: GMAT Algebra, GMAT Data Sufficiency, GMAT Quantitative, GMAT Quantitative Descrete Questions, GMAT Question of the Day Read 1259 articles by Take GMAT Team

1. Byron says:

   July 24, 2007 at 10:04 pm

   No it doesn’t. This is only true when r=1, anything higher and the two sides will not equal eachother.
   Ex. 19s =19(s-2)+2
   19s=19s-38+2
   0=-36 is false.
2. Amishe800 says:

   July 25, 2007 at 12:40 am

   Ans is ‘E’

   As rs=rx-2 is equal only if r =1 and we dont know the value of R …
3. abbas says:

   July 25, 2007 at 1:07 pm

   e
4. animesh says:

   July 25, 2007 at 7:41 pm

   the answer is “E”……because of the insufficient data provided nd cannot be answered using 2 given statements
5. AP says:

   July 26, 2007 at 9:35 am

   e
6. Ardhendu says:

   July 26, 2007 at 10:05 am

   Don’t know options its insufficient data
7. prateek tayal says:

   July 26, 2007 at 4:31 pm

   ya yar here is data unsufficient
   it can naot be answered
8. gaurav says:

   July 30, 2007 at 10:11 am

   E
9. john says:

   January 23, 2008 at 12:14 pm

   E) is the ans…
   anyways we cant find whether they r equal or not…
10. manisha says:

    May 19, 2008 at 3:04 pm

    E
11. shilpa says:

    August 27, 2008 at 1:00 am

    E
12. Kumar says:

    July 29, 2009 at 6:10 pm

    from 1 we have, s=x-2 3s=3x-2…. and so on for all the odd numbers
    from 2 we have ,rs= rs+2r-2 which implies r=1
    so separtely both statement can not satisfy
    But if you combine both statements we get s=s.
    So the answe is “YES”.
    By combining two statements we get the conclusion.
13. Kumar says:

    July 29, 2009 at 6:12 pm

    Answer is C

    from 1 we have, s=x-2 3s=3x-2…. and so on for all the odd numbers
    from 2 we have ,rs= rs+2r-2 which implies r=1
    so separtely both statement can not satisfy
    But if you combine both statements we get s=s.
    So the answe is “YES”.
    By combining two statements we get the conclusion but not alone from any statement.
14. Radhika says:

    July 29, 2009 at 8:26 pm

    Answer is B
    We can solve and get r = 1… and we know that x = s+2… if we plug in any values for x and s the equation rs=rx-2 holds true…
15. deepak says:

    July 29, 2009 at 9:33 pm

    Combining both the statements we can get the ans…So my take is option C
16. Binita says:

    July 29, 2009 at 10:04 pm

    C
17. Bindhu says:

    July 30, 2009 at 1:18 am

    B is the ans

    rs = rx-2

    a) is not sufficient to answer the question
    b) x = s+2
    so, s = x-2
    r(x-2) = rx-2 ?
    rx -2r = rx – 2 ==> -2r = -2
    r =1

    so, s = x -2.
18. GG says:

    July 30, 2009 at 1:28 am

    E
19. eman says:

    July 30, 2009 at 1:32 am

    E is the answer
    there are 3 variables, r, x and s in the equation:

    a) not sufficient, since there is no relationship between x and s
    this rules out (d)
    b) not sufficient as it doesnot state anything about another variable r
    To evaluate answer (c) both a & b together solve the problem
    c)combining (a) & (b)

    for r= 1(odd number) rs = rx – 2 – YES
    for r = 3 (odd number) rs = rx – 3 – NO.

    Hence the answer is E.
20. Sandy says:

    July 30, 2009 at 1:36 am

    B is the right answer
21. hydkun says:

    July 30, 2009 at 3:35 am

    Ans is E.

    1. Restate problem: (always to make easy selections)
    Is rs=rx-2 =? => Is r(x-s)=2 ?

    2. Check condition 1: r is random
    dont know (x-s), throw out A,D

    3. Check condition two: x=r+2
    => x-s=2.
    But, r is unknow, throw out B

    4. Both conditions imply:

    r.2=2

    If r=1; then r(x-s)=2
    If r=3; then r(x-s)2

    Yes, No combination => answer is not unique => throw out C

    E is the answer

    Cheers,K
22. Brittney says:

    July 30, 2009 at 10:24 am

    answers is e.

    fact of the matter is, in (2), you have 2 variables, so you have no possible way to get ONE clear concise answer. If r is odd, that also leaves plenty of possible solutions. This is Data Sufficiency. Is the data sufficient enough to solve the problem. It is not.
23. krishna74 says:

    July 30, 2009 at 11:34 am

    E
24. Priyanka says:

    July 30, 2009 at 1:40 pm

    I think ans. is E.
    TakeGmat plz tell the ans.
25. Kofi DL says:

    July 30, 2009 at 8:24 pm

    …
26. Ronak says:

    July 31, 2009 at 2:00 pm

    Defintly its E—Given data is insufficient…
27. Gmat2009 says:

    August 5, 2009 at 4:55 pm

    E
28. shubratha says:

    August 9, 2009 at 7:17 pm

    Can GMAT Team plz give us the answer..
    I am confused btw E or B? as from B we get to know value of s & R also..
29. Vidhi says:

    September 30, 2009 at 6:24 pm

    e