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# How many papers can Bill and Tim proofread in 60 minutes if they are

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Director
Joined: 22 Jun 2014
Posts: 896

Kudos [?]: 420 [0], given: 111

Location: India
Concentration: General Management, Technology
GMAT 1: 540 Q45 V20
GPA: 2.49
WE: Information Technology (Computer Software)
How many papers can Bill and Tim proofread in 60 minutes if they are [#permalink]

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16 Sep 2017, 02:05
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Difficulty:

25% (medium)

Question Stats:

74% (00:38) correct 26% (00:32) wrong based on 34 sessions

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How many papers can Bill and Tim proofread in 60 minutes if they are working together?

(1) Bill can proofread twice as many papers as Tim in the same time period.

(2) Tim can proofread 30 fewer papers than Bill in 60 minutes.
[Reveal] Spoiler: OA

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Kudos [?]: 420 [0], given: 111

Senior Manager
Joined: 25 Feb 2013
Posts: 417

Kudos [?]: 179 [0], given: 31

Location: India
GPA: 3.82
Re: How many papers can Bill and Tim proofread in 60 minutes if they are [#permalink]

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17 Sep 2017, 01:38
HKD1710 wrote:
How many papers can Bill and Tim proofread in 60 minutes if they are working together?

(1) Bill can proofread twice as many papers as Tim in the same time period.

(2) Tim can proofread 30 fewer papers than Bill in 60 minutes.

Let Bill read $$x$$ papers and Tim $$y$$ in $$60$$ minutes

Statement 1: implies $$x=2y$$. two variable, one equation hence insufficient

Statement 2: implies $$x=y+30$$. two variable, one equation hence insufficient

Combining 1 & 2 we have two variable and two linear equations. Hence can be solved to find the value of $$x$$ & $$y$$. Sufficient

Option C

Kudos [?]: 179 [0], given: 31

Re: How many papers can Bill and Tim proofread in 60 minutes if they are   [#permalink] 17 Sep 2017, 01:38
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