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Both numerator and denominator are increased by 30

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Intern
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Joined: 15 Nov 2009
Posts: 29
Schools: Kelley
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Kudos [?]: 6 [0], given: 4

Both numerator and denominator are increased by 30 [#permalink] New post 02 Dec 2009, 10:02
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Qn 87, Page 280. Answer credited is E.

d1/r1

Both numerator and denominator are increased by 30

d2 = (d1 + 30)
r2 = (r1 + 30)

Now, I cant think of any scenario where increasing the numerator and denomintor by an equal value will not cause the new fraction to be either equal to or greater than the old fraction? It certainly cannot be less than the old fraction - what am I missing?
Senior Manager
Senior Manager
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Joined: 30 Aug 2009
Posts: 291
Location: India
Concentration: General Management
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Kudos [?]: 87 [0], given: 5

GMAT Tests User
Re: GMAT OG - 12th Edition, DS Qn 87 [#permalink] New post 02 Dec 2009, 10:16
junker wrote:
Qn 87, Page 280. Answer credited is E.

d1/r1

Both numerator and denominator are increased by 30

d2 = (d1 + 30)
r2 = (r1 + 30)

Now, I cant think of any scenario where increasing the numerator and denomintor by an equal value will not cause the new fraction to be either equal to or greater than the old fraction? It certainly cannot be less than the old fraction - what am I missing?


please post the question as all may not have OG12 with them (I dont have :-|)
VP
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Joined: 05 Mar 2008
Posts: 1477
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Kudos [?]: 193 [0], given: 31

GMAT Tests User
Re: GMAT OG - 12th Edition, DS Qn 87 [#permalink] New post 02 Dec 2009, 11:09
junker wrote:
Qn 87, Page 280. Answer credited is E.

d1/r1

Both numerator and denominator are increased by 30

d2 = (d1 + 30)
r2 = (r1 + 30)

Now, I cant think of any scenario where increasing the numerator and denomintor by an equal value will not cause the new fraction to be either equal to or greater than the old fraction? It certainly cannot be less than the old fraction - what am I missing?


-30/-60 = 1/2

-30+30/-60+30 = 0/-30 = 0 less than 1/2
Intern
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Joined: 15 Nov 2009
Posts: 29
Schools: Kelley
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Kudos [?]: 6 [0], given: 4

Re: GMAT OG - 12th Edition, DS Qn 87 [#permalink] New post 02 Dec 2009, 14:46
See that explanation does not make any sense. d1 is distance and r1 is rate of speed. These cannot possible be negative. I dont think the explanation is correct yet.

Anybody care to explain hwo the answer credited in the book can be correct?
VP
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Kudos [?]: 193 [0], given: 31

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Re: GMAT OG - 12th Edition, DS Qn 87 [#permalink] New post 02 Dec 2009, 15:56
junker wrote:
See that explanation does not make any sense. d1 is distance and r1 is rate of speed. These cannot possible be negative. I dont think the explanation is correct yet.

Anybody care to explain hwo the answer credited in the book can be correct?


I can't really understand what your asking

The question just wants to know if if t1 > t2

they can be equal or one can be greater so the answer is E

Not to sure where's the confusion
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Re: GMAT OG - 12th Edition, DS Qn 87 [#permalink] New post 03 Dec 2009, 01:30
If we're dealing only with positive quantities:

If the numerator of a fraction is larger than the denominator, and you add 30 to both, the value of the fraction goes down:

10/3 is greater than 40/33, for example

If the numerator is smaller than the denominator, and you add 30 to both, the value of the fraction goes up:

1/2 is less than 31/32, for example
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Re: GMAT OG - 12th Edition, DS Qn 87   [#permalink] 03 Dec 2009, 01:30
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