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Inequality Rules - Can we multiply x>5 , y>5

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rockrock
 Post subject: Inequality Rules - Can we multiply x>5 , y>5
 Post Posted: Mon Jul 26, 2010 4:42 pm 
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Course Students


Posts: 38
From the MGMAT EIV Flashcards, #21.

The question is whether this statement is sufficient:

xy<25
1) x and y are <25.

The answer is that it's not sufficient since both x and y can be negative.

The flashcard then asks:
Can we multiply x>5 and y>5 to say sufficiently that xy>25?

My answer is Yes, since we know they are both positive. Is that correct?
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parthatayi
 Post subject: Re: Inequality Rules - Can we multiply x>5 , y>5
 Post Posted: Tue Aug 03, 2010 1:13 am 
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Course Students


Posts: 40
rockrock wrote:
From the MGMAT EIV Flashcards, #21.

The question is whether this statement is sufficient:

xy<25
1) x and y are <25.

The answer is that it's not sufficient since both x and y can be negative.

The flashcard then asks:
Can we multiply x>5 and y>5 to say sufficiently that xy>25?

My answer is Yes, since we know they are both positive. Is that correct?


Yes correct.Two positive numbers can be multiplied.

Thanks and Regards,
Partha.
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tim
 Post subject: Re: Inequality Rules - Can we multiply x>5 , y>5
 Post Posted: Sat Sep 04, 2010 10:13 pm 
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ManhattanGMAT Staff


Posts: 1779
Location: Southwest Airlines, seat 21C
indeed..

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