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Help Needed for Inequality Questions

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Help Needed for Inequality Questions [#permalink]

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New post 16 Jul 2009, 00:17
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Quetion1 --> Is the Integer n a multiple of 15?

1. n is a multiple of 15.
2. n + 6 is a multiple of 3.

1. 1 alone is suff.
2. 2 alone is suff.
3. 1 and 2 together are sufficient.
4. Each statement is suff.
5. Stat 1 & 2 together are not sufficient.

Question2 --> Is X>0?

Again a data suff one

1. xy > 0.
2. x + y > 0

Question 3 --> If x and y are integers and x > 0, is y>0 ?

One more on data suff.

1. 7x - 2y > 0.
2. -y < x.

Please help me to get the answers for the above questions.

Thanks in advance.

Cheers !!
Aban

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Director
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Joined: 03 Jun 2009
Posts: 782

Kudos [?]: 903 [0], given: 56

Location: New Delhi
WE 1: 5.5 yrs in IT
Re: Help Needed for Inequality Questions [#permalink]

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New post 16 Jul 2009, 00:42
pareekpuneet wrote:
Quetion1 --> Is the Integer n a multiple of 15?

1. n is a multiple of 15.
2. n + 6 is a multiple of 3.


1. n is a multiple of 15. Sufficient, this is what questions is asking.

2. n + 6 is a multiple of 3. Insufficient.
(n+6) can have values like 9, 12, 15, 21 etc
Only in case (n+6) is 21, n would be a multiple of 15. For other values, its not.

Hence answer is A.
_________________

ISB 2011-12 thread | Ask ISB Alumni @ ThinkISB
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Kudos [?]: 903 [0], given: 56

Director
Director
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Joined: 03 Jun 2009
Posts: 782

Kudos [?]: 903 [0], given: 56

Location: New Delhi
WE 1: 5.5 yrs in IT
Re: Help Needed for Inequality Questions [#permalink]

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New post 16 Jul 2009, 00:51
pareekpuneet wrote:
Question2 --> Is X>0?

Again a data suff one

1. xy > 0.
2. x + y > 0


1. xy > 0 - Insufficient
For this to be true, either both x and y should be +ve or both -ve
Example 1: x=-2, y=-3
xy = 6 >0

Example 2: x=2, y=3
xy = 6 >0

hence Insufficient to determine if x is +ve or -ve

2. x + y > 0 ...Insuffiecient
This can be possible for
Example 1: x=-2 and y=5
Example 2: x= 2 and y=5

hence Insufficient to determine if x is +ve or -ve

3. Together: Sufficient
From 1 we know either both x and y are +ve or both -ve
2nd option cannot be held true for both x and y being -ve
Hence both are positive.

Answer C
_________________

ISB 2011-12 thread | Ask ISB Alumni @ ThinkISB
All information related to Indian candidates and B-schools | Indian B-schools accepting GMAT scores
Self evaluation for Why MBA?

Kudos [?]: 903 [0], given: 56

Director
Director
User avatar
Joined: 03 Jun 2009
Posts: 782

Kudos [?]: 903 [0], given: 56

Location: New Delhi
WE 1: 5.5 yrs in IT
Re: Help Needed for Inequality Questions [#permalink]

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New post 16 Jul 2009, 01:32
pareekpuneet wrote:
Question 3 --> If x and y are integers and x > 0, is y>0 ?
One more on data suff.

1. 7x - 2y > 0.
2. -y < x.


Given x > 0, to find if y>0

1. 7x - 2y > 0
or, 2y < 7x
or, y < 7/2x ... insufficient
Example, when x = 2
y < 7, means y can have -ve or +ve value less than 7

2. -y < x
or, y > -x ... insufficient
Example, when x = 2
y > -2, means y can be -1, 0, 1, 2 .. etc

3. Together ... Insufficient
-x < y < 7/2x
Example, when x = 2
=> -2 < y < 7
Hence y can have both +ve and -ve value

Answer E
_________________

ISB 2011-12 thread | Ask ISB Alumni @ ThinkISB
All information related to Indian candidates and B-schools | Indian B-schools accepting GMAT scores
Self evaluation for Why MBA?

Kudos [?]: 903 [0], given: 56

Re: Help Needed for Inequality Questions   [#permalink] 16 Jul 2009, 01:32
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