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Re: DS - Number Properties, Absolute Value [#permalink]

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28 Jan 2009, 12:14

scthakur wrote:

I think, answer should be C.

if x = 2, y = 3 and z = 5, then from stmt1: 2 + 3 = 5. Also, |x| = 2 and y - z = -2 Hence, |x| does not equal y - z

Similarly, if x = -2. y = -3 and z = -5 then |x| = 2 y - z = 2

And |x| = y-z.

Thus, in order for|x| = y-z to be true, both statements are required. Hence, C should be the answer.

My weak point in Quant is always DS and in specific it worst when they are related to Absolute values / Inequalities.

Can one of you please explain why my approach is wrong.

Stmt 1 - X + Y = Z ==> X = Z - Y or -X = Y - Z ==> |X| = Y-Z. Sufficient.

Stmt 2 - X < 0 but no information related to Y & Z. Insufficient.

I know we can solve the DS questions by picking the numbers intelligently. But I am not able to rely on that process 100 %. So looking for alternate approaches on tackling DS questions.

Re: DS - Number Properties, Absolute Value [#permalink]

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28 Jan 2009, 13:09

mrsmarthi wrote:

scthakur wrote:

I think, answer should be C.

if x = 2, y = 3 and z = 5, then from stmt1: 2 + 3 = 5. Also, |x| = 2 and y - z = -2 Hence, |x| does not equal y - z

Similarly, if x = -2. y = -3 and z = -5 then |x| = 2 y - z = 2

And |x| = y-z.

Thus, in order for|x| = y-z to be true, both statements are required. Hence, C should be the answer.

My weak point in Quant is always DS and in specific it worst when they are related to Absolute values / Inequalities.

Can one of you please explain why my approach is wrong.

Stmt 1 - X + Y = Z ==> X = Z - Y or -X = Y - Z ==> |X| = Y-Z. Sufficient.

Stmt 2 - X < 0 but no information related to Y & Z. Insufficient.

I know we can solve the DS questions by picking the numbers intelligently. But I am not able to rely on that process 100 %. So looking for alternate approaches on tackling DS questions.

statemet 1: -X = Y - Z --> we don't the whether X is +ve or -ve assume X +ve then X= -Y+Z --> |X|=Z-Y ( answer No) when x is -ve then -X= Y-Z --> |X|=Y-Z (answer Yes) so not suffcieint

combine wiht stat2: X<0 it is suffcient.
_________________

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Re: DS - Number Properties, Absolute Value [#permalink]

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28 Jan 2009, 23:28

x2suresh wrote:

mrsmarthi wrote:

scthakur wrote:

I think, answer should be C.

if x = 2, y = 3 and z = 5, then from stmt1: 2 + 3 = 5. Also, |x| = 2 and y - z = -2 Hence, |x| does not equal y - z

Similarly, if x = -2. y = -3 and z = -5 then |x| = 2 y - z = 2

And |x| = y-z.

Thus, in order for|x| = y-z to be true, both statements are required. Hence, C should be the answer.

My weak point in Quant is always DS and in specific it worst when they are related to Absolute values / Inequalities.

Can one of you please explain why my approach is wrong.

Stmt 1 - X + Y = Z ==> X = Z - Y or -X = Y - Z ==> |X| = Y-Z. Sufficient.

Stmt 2 - X < 0 but no information related to Y & Z. Insufficient.

I know we can solve the DS questions by picking the numbers intelligently. But I am not able to rely on that process 100 %. So looking for alternate approaches on tackling DS questions.

statemet 1: -X = Y - Z --> we don't the whether X is +ve or -ve assume X +ve then X= -Y+Z --> |X|=Z-Y ( answer No) when x is -ve then -X= Y-Z --> |X|=Y-Z (answer Yes) so not suffcieint

combine wiht stat2: X<0 it is suffcient.

Just keep in mind that with absolute values you are usually going to deal with 2 values (+/-)

Re: DS - Number Properties, Absolute Value [#permalink]

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29 Jan 2009, 03:09

mrsmarthi wrote:

My weak point in Quant is always DS and in specific it worst when they are related to Absolute values / Inequalities.

Can one of you please explain why my approach is wrong.

Stmt 1 - X + Y = Z ==> X = Z - Y or -X = Y - Z ==> |X| = Y-Z. Sufficient.

Stmt 2 - X < 0 but no information related to Y & Z. Insufficient.

I know we can solve the DS questions by picking the numbers intelligently. But I am not able to rely on that process 100 %. So looking for alternate approaches on tackling DS questions.

What you are missing in the statement highlighted in red is that you are putting the left side in mod but not the right side. If I follow your steps then |-x| = |y-z| or, |x| = |y-z|

Re: DS - Number Properties, Absolute Value [#permalink]

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29 Jan 2009, 15:38

scthakur wrote:

mrsmarthi wrote:

My weak point in Quant is always DS and in specific it worst when they are related to Absolute values / Inequalities.

Can one of you please explain why my approach is wrong.

Stmt 1 - X + Y = Z ==> X = Z - Y or -X = Y - Z ==> |X| = Y-Z. Sufficient.

Stmt 2 - X < 0 but no information related to Y & Z. Insufficient.

I know we can solve the DS questions by picking the numbers intelligently. But I am not able to rely on that process 100 %. So looking for alternate approaches on tackling DS questions.

What you are missing in the statement highlighted in red is that you are putting the left side in mod but not the right side. If I follow your steps then |-x| = |y-z| or, |x| = |y-z|

That is why stmt1 by itself is not sufficient.

yep true.....I missed that. Now I got it. Thank you.