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Source: — Problem Solving |
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by pandeyvineet24 » Sun Jun 29, 2008 5:07 pm
hi rookieingmat.

The answer should be B.

10^8-10^2
------------ =
10^7-10^3


10^2(10^6 - 1)
----------------- =~
10^3(10^4 - 1)

10^6
----- ~ 10
10^4 * 10
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Bingo!

by rookieingmat » Sun Jun 29, 2008 5:35 pm
Thats the correct answer. Thanks, PandeyVineet24!
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by Sunny22uk » Tue Jul 01, 2008 8:53 pm
Could you please elobrate on how you do this
10^2(10^6 - 1)
----------------- =~
10^3(10^4 - 1)

10^6
----- ~ 10
10^4 * 10
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Re: GMAT Prep

by Stuart@KaplanGMAT » Wed Jul 02, 2008 10:51 am
rookieingmat wrote:could someone solve this?

The value of

10^8-10^2
------------
10^7-10^3

A. 1
B. 10
C. 10^2
D. 10^3
E. 10^4
This problem has been discussed before - it's always good to search the forums before posting!

There's a much simpler way to solve this question, and that's through estimation.

Let's look at the top:

10^8 - 10^2

Well, 10^2 is pretty insignificant compared to 10^8 (100 is a LOT smaller than 100000000). So, we can estimate the numerator as simply 10^8.

Same thing on the bottom:

10^7 - 10^3

10000000 is a LOT more than 1000. We can estimate the denominator as simply 10^7.

So, we really have:

10^8/10^7 = 10^1 = 10
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by Sunny22uk » Wed Jul 02, 2008 11:14 am
ok I got it now, Basically 10^6-1 and 10^4-1 are approximately 10^6 and 10^4.
Thanks Stuart.
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approximation

by vladmire » Sat Dec 20, 2008 7:16 pm
I was under the impression that 10^8-10^2 = 10^6/
10^7-10^3 = 10^4
which would equal 10^2
why doesn't this work whoud the question does state closest to the following
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Re: GMAT Prep

by logitech » Sat Dec 20, 2008 7:42 pm
rookieingmat wrote:could someone solve this?

The value of

10^8-10^2
------------
10^7-10^3

A. 1
B. 10
C. 10^2
D. 10^3
E. 10^4
None of them is the correct answer because the way you asked this question is looking for a VALUE. If you had asked "approximately", answer should have been 10 otherwise it is actually:

F) 10.0009901

:lol:
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