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Math Expert V
Joined: 02 Sep 2009
Posts: 58320
The sum of 9 minutes, 50 seconds and x is 34 percent of one hour. What  [#permalink]

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Difficulty:   15% (low)

Question Stats: 79% (01:58) correct 21% (01:41) wrong based on 60 sessions

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The sum of 9 minutes, 50 seconds and x is 34 percent of one hour. What does x equal?

A. 50 minutes, 10 seconds
B. 34 minutes, 00 seconds
C. 10 minutes, 34 seconds
D. 20 minutes, 24 seconds
E. 39 minutes, 36 seconds

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Intern  B
Joined: 16 Apr 2017
Posts: 12
Re: The sum of 9 minutes, 50 seconds and x is 34 percent of one hour. What  [#permalink]

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1
9min 50sec ~ 10min
34% of 60min ~ 20min
10+x=20
x = 10
Only C matches the answer.
Hence, answer is C.

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Senior PS Moderator V
Joined: 26 Feb 2016
Posts: 3333
Location: India
GPA: 3.12
The sum of 9 minutes, 50 seconds and x is 34 percent of one hour. What  [#permalink]

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Bunuel wrote:
The sum of 9 minutes, 50 seconds and x is 34 percent of one hour. What does x equal?

A. 50 minutes, 10 seconds
B. 34 minutes, 00 seconds
C. 10 minutes, 34 seconds
D. 20 minutes, 24 seconds
E. 39 minutes, 36 seconds

34% of an hour(3600 seconds) is 34/100 * 3600 = 34 * 36 = 35*35 - 1 = 1224 seconds.

Since we have 9 minutes and 50 seconds, which is 9*60 + 50 = 590 seconds
The remainder is 634 seconds(which is 10 minutes and 34 seconds) which must be added.

Therefore, x equal 10 minutes, 34 seconds(Option C)

P.S When the answer options are far apart, approximations may work, but with close
answer options it makes sense to convert the time into seconds.
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Target Test Prep Representative D
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
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Re: The sum of 9 minutes, 50 seconds and x is 34 percent of one hour. What  [#permalink]

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Bunuel wrote:
The sum of 9 minutes, 50 seconds and x is 34 percent of one hour. What does x equal?

A. 50 minutes, 10 seconds
B. 34 minutes, 00 seconds
C. 10 minutes, 34 seconds
D. 20 minutes, 24 seconds
E. 39 minutes, 36 seconds

34 percent of 1 hour is 0.34 x 60 = 20.4 minutes = 20 minutes and 24 seconds

Thus, x must be 10 minutes and 34 seconds, since 9 min + 10 min = 19 min, and 50 sec + 34 sec = 84 sec = 1 min 24 sec, making a total of 19 min + 1 min 24 sec = 20 min 24 sec.

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Re: The sum of 9 minutes, 50 seconds and x is 34 percent of one hour. What  [#permalink]

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Bunuel wrote:
The sum of 9 minutes, 50 seconds and x is 34 percent of one hour. What does x equal?

A. 50 minutes, 10 seconds
B. 34 minutes, 00 seconds
C. 10 minutes, 34 seconds
D. 20 minutes, 24 seconds
E. 39 minutes, 36 seconds

$$9*60 + 50 + x = \frac{34}{100}*60*60$$

$$590 + x = 1224$$

So, $$x = 634$$

Answer will be (C) 10 minutes, 34 seconds
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How to use Search Function in GMAT Club | Rules for Posting in QA forum | Writing Mathematical Formulas |Rules for Posting in VA forum | Request Expert's Reply ( VA Forum Only ) Re: The sum of 9 minutes, 50 seconds and x is 34 percent of one hour. What   [#permalink] 18 Jan 2018, 11:05
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