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70% of 66 is 10% more than what number ?

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Math Expert
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Joined: 02 Sep 2009
Posts: 50042
70% of 66 is 10% more than what number ?  [#permalink]

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New post 11 Jan 2018, 21:17
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

66% (00:48) correct 34% (01:09) wrong based on 77 sessions

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Intern
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Joined: 22 Nov 2017
Posts: 25
Location: United States
Concentration: Technology, Healthcare
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Re: 70% of 66 is 10% more than what number ?  [#permalink]

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New post 11 Jan 2018, 21:24
70/100 of 66 = 110/100 of X . So X=42

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70% of 66 is 10% more than what number ?  [#permalink]

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New post 21 Sep 2018, 05:53
Hi guys,
My answer is as follows

70% of 66 = 66*(7/10)
Let the number we need to find is X

->>[66*(7/10) - X] / X = 1/10
<=> 7*66 - 10X = X
<=> 7*66 = 11X
<=> X = 7*6
<=> X = 42

Hope it's clear :D
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Re: 70% of 66 is 10% more than what number ?  [#permalink]

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New post 21 Sep 2018, 08:09
1
Top Contributor
Bunuel wrote:
70% of 66 is 10% more than what number

A. 50.82
B. 46.2
C. 43
D. 42
E. 41.58


Question: 70% of 66 is 10% more than what number
Rewrite as: (0.7)(66) = 1.1x
So: x = (0.7)(66)/(1.1)
Multiply top and bottom by 10 to get: x = (7)(66)/(11)
Simplify to get: to get: x = (7)(6)
So, x = 42

Answer: D

Cheers,
Brent
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Brent Hanneson – GMATPrepNow.com
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Joined: 04 Sep 2015
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Re: 70% of 66 is 10% more than what number ?  [#permalink]

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New post 21 Sep 2018, 12:05
Bunuel wrote:
70% of 66 is 10% more than what number

A. 50.82
B. 46.2
C. 43
D. 42
E. 41.58



70/100*66=110/100*x

x=7*6=42.
Director
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Re: 70% of 66 is 10% more than what number ?  [#permalink]

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New post 28 Sep 2018, 03:24
10/11*7/10*66=42

D
GMAT Club Bot
Re: 70% of 66 is 10% more than what number ? &nbs [#permalink] 28 Sep 2018, 03:24
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