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MGMAT - Distance Between A and D

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Manager
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Joined: 16 Feb 2009
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Schools: Anderson FEMBA
MGMAT - Distance Between A and D [#permalink]

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New post 01 Aug 2009, 23:42
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A
B
C
D
E

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---A---B---C---D---

The integers A, B, C, and D shown on the number line above are equally spaced. If C and D are equal to 5^12 and 5^13, respectively, what is the value of A?

(A) 5^11
(B) 5^10
(C) -5^12
(D) (-7)*5^12
(E) (-12)*5^13

Kudos [?]: 136 [0], given: 1

Director
Director
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Joined: 05 Jun 2009
Posts: 815

Kudos [?]: 359 [0], given: 106

WE 1: 7years (Financial Services - Consultant, BA)
Re: MGMAT - Distance Between A and D [#permalink]

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New post 02 Aug 2009, 02:18
Distance between adjacent numbers= D - C = (5^12)* (5-1) = 4* (5^12)

A = C - (distance *2) = 5^12 - 2*(4*5^12)
=(-7) * 5^12

Hence, D
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Kudos [?]: 359 [0], given: 106

Manager
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Joined: 14 Apr 2008
Posts: 51

Kudos [?]: 1 [0], given: 0

Re: MGMAT - Distance Between A and D [#permalink]

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New post 02 Aug 2009, 04:31
5^13=a + (4-1)(5^13-5^12)
a = 5^13- (12*5^12)
a= -7* 5^12

Kudos [?]: 1 [0], given: 0

Re: MGMAT - Distance Between A and D   [#permalink] 02 Aug 2009, 04:31
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MGMAT - Distance Between A and D

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