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(3*10^20)(8*10^30) =

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Math Expert
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V
Joined: 02 Sep 2009
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Kudos [?]: 135629 [0], given: 12705

(3*10^20)(8*10^30) = [#permalink]

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New post 20 Nov 2017, 11:32
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

85% (00:46) correct 15% (00:21) wrong based on 32 sessions

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Kudos [?]: 135629 [0], given: 12705

Senior Manager
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Joined: 13 Oct 2016
Posts: 284

Kudos [?]: 159 [0], given: 387

Concentration: Operations, Leadership
GMAT 1: 600 Q44 V28
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Re: (3*10^20)(8*10^30) = [#permalink]

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New post 20 Nov 2017, 12:27
(3*10^20)(8*10^30) = 24*10^50=2.4*10^51
Hence answer is B.
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Kudos [?]: 159 [0], given: 387

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GMAT 1: 650 Q49 V30
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Re: (3*10^20)(8*10^30) = [#permalink]

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New post 20 Nov 2017, 15:35
3*8=24
10^20 * 10^30 = 10^50
24= 2.4*10
Everything can be rewritten
2.4* 10^51
B is the answer

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Re: (3*10^20)(8*10^30) = [#permalink]

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New post 27 Nov 2017, 11:14
Bunuel wrote:
\((3*10^{20})(8*10^{30}) =\)

A. 2.4 × 10^50
B. 2.4 × 10^51
C. 2.4 × 10^60
D. 2.4 × 10^61
E. 2.4 × 10^301


Simplifying the given equation we have:

24 x 10^50 = 2.4 x 10^51

Answer: B
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Jeffery Miller
Head of GMAT Instruction

GMAT Quant Self-Study Course
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Kudos [?]: 981 [0], given: 5

Re: (3*10^20)(8*10^30) =   [#permalink] 27 Nov 2017, 11:14
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