A good old problem by Akhamai: What is: 14387100 / : PS Archive
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# A good old problem by Akhamai: What is: 14387100 /

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A good old problem by Akhamai: What is: 14387100 / [#permalink]

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31 Oct 2004, 19:35
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A good old problem by Akhamai:

What is:

14387100 / (14387100^2 - (14387105 * 14387095))?

(remember you have only 2 minutes...)

A) 143871
B) 287742
C) 575484
D) 1438710
E) 2877420
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Paul

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Joined: 16 Jun 2004
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31 Oct 2004, 21:21
14387100 / (14387100^2 - (14387105 * 14387095))

=>14387100/(14387100^2 - (14387100+5)(14387100-5)))
=>14387100/(14387100^2 - (14387100^2 - 5^2))
=>14387100/25
= 575484
C.
GMAT Club Legend
Joined: 15 Dec 2003
Posts: 4302
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Kudos [?]: 429 [0], given: 0

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01 Nov 2004, 20:37
Great job venksune, OA is C. Too bad not many people tried it. It is really a good problem. An alternative approach would be to look at 14387100 as "a"
You then have a / [a^2 - (a+5)(a-5)]
You will avoid writing all those numbers
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Best Regards,

Paul

01 Nov 2004, 20:37
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