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What is 10(1/2 + 1/5 + 1/10)^(-1)?

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Math Expert
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Joined: 02 Sep 2009
Posts: 55150
What is 10(1/2 + 1/5 + 1/10)^(-1)?  [#permalink]

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New post 23 Apr 2019, 02:20
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

65% (00:49) correct 35% (00:42) wrong based on 20 sessions

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Director
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Joined: 18 Jul 2018
Posts: 897
Location: India
Concentration: Finance, Marketing
WE: Engineering (Energy and Utilities)
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Re: What is 10(1/2 + 1/5 + 1/10)^(-1)?  [#permalink]

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New post 23 Apr 2019, 02:51
LCM of 1/2+1/5+1/10 = 8/10.
As the power of 8/10 is -1.
The fraction can be rewritten as 10/8
Now, 10*10/8 = 25/2


C is the answer
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Re: What is 10(1/2 + 1/5 + 1/10)^(-1)?   [#permalink] 23 Apr 2019, 02:51
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What is 10(1/2 + 1/5 + 1/10)^(-1)?

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