GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 22 Jan 2019, 01:02

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Events & Promotions

Events & Promotions in January
PrevNext
SuMoTuWeThFrSa
303112345
6789101112
13141516171819
20212223242526
272829303112
Open Detailed Calendar
• The winners of the GMAT game show

January 22, 2019

January 22, 2019

10:00 PM PST

11:00 PM PST

In case you didn’t notice, we recently held the 1st ever GMAT game show and it was awesome! See who won a full GMAT course, and register to the next one.
• Key Strategies to Master GMAT SC

January 26, 2019

January 26, 2019

07:00 AM PST

09:00 AM PST

Attend this webinar to learn how to leverage Meaning and Logic to solve the most challenging Sentence Correction Questions.

Is x < y?

Author Message
Manager
Joined: 03 Mar 2018
Posts: 215

Show Tags

05 Mar 2018, 06:22
3
00:00

Difficulty:

55% (hard)

Question Stats:

61% (02:04) correct 39% (01:06) wrong based on 33 sessions

HideShow timer Statistics

Is x < y?

(1) $$\frac{1}{x}$$ < $$\frac{1}{y}$$

(2) x + y = 10

--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________

Math Expert
Joined: 02 Aug 2009
Posts: 7212

Show Tags

05 Mar 2018, 06:38
itisSheldon wrote:
Is x < y?

(1) $$\frac{1}{x}$$ < $$\frac{1}{y}$$

(2) x + y = 10

(1) $$\frac{1}{x}$$ < $$\frac{1}{y}$$....
a) if both x and y are POSITIVE $$\frac{1}{x}$$ < $$\frac{1}{y}.....y<x$$....
b) if x is NEGATIVE and y is POSITIVE $$\frac{1}{x}$$ < $$\frac{1}{y}.....y>x$$....
so insuff

(2) x + y = 10
nothing at all..
insuff

combined
both positive..
x = 6 and y = 4.. x>y possible

both negative .. Not possible
x negative and y positive..
x=-2 and y=12... x<y

insuff

E
_________________

1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html

GMAT online Tutor

Math Expert
Joined: 02 Sep 2009
Posts: 52367

Show Tags

05 Mar 2018, 07:02
chetan2u wrote:
itisSheldon wrote:
Is x < y?

(1) $$\frac{1}{x}$$ < $$\frac{1}{y}$$

(2) x + y = 10

(1) $$\frac{1}{x}$$ < $$\frac{1}{y}$$....
a) if both x and y are POSITIVE$$\frac{1}{x}$$ < $$\frac{1}{y}.....y<x$$....
b) if both x and y are NEGATIVE$$\frac{1}{x}$$ < $$\frac{1}{y}.....y>x$$....
so insuff

(2) x + y = 10
nothing at all..
insuff

combined
both positive..
x = 6 and y = 4.. x>y possible

both negative .. Not possible
x negative and y positive..
x=-2 and y=12.. x<y

insuff

E

The red part is not correct.

Is x < y?

(1) $$\frac{1}{x} < \frac{1}{y}$$.

If x and y have the same sign, then y < x.
If x and y have the opposite signs (so when x is negative and y is positive, because the reverse is not possible), then y > x.

Not sufficient.

(2) x + y = 10. Clearly not sufficient.

(1)+(2) x and y could still have the same sign, for example, consider x = 6 and y = 4 (in this case y < x) as well as they could have the opposite signs, for example, x = -1 and y = 11 (in this case y > x). Not sufficient.

_________________
Math Expert
Joined: 02 Aug 2009
Posts: 7212
Re: Is x < y?  [#permalink]

Show Tags

05 Mar 2018, 07:09
1
Bunuel wrote:
chetan2u wrote:
itisSheldon wrote:
Is x x[/m]....[/color]
so insuff

(2) x + y = 10
nothing at all..
insuff

combined
both positive..
x = 6 and y = 4.. x>y possible

both negative .. Not possible
[b]x negative and y positive..
x=-2 and y=12.. x x.

Not sufficient.

(2) x + y = 10. Clearly not sufficient.

(1)+(2) x and y could still have the same sign, for example, consider x = 6 and y = 4 (in this case y x). Not sufficient.

Thanks Bunuel...
it was typo because of copy and paste of previous statement..
it meant x negative and y positive as also given in the Combined portion..

--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________

1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html

GMAT online Tutor

Re: Is x < y? &nbs [#permalink] 05 Mar 2018, 07:09
Display posts from previous: Sort by