It takes Amy between 6 and 7 minutes to grill a steak ...

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gmattesttaker2: Legendary Member; Posts: 641; Joined: Tue Feb 14, 2012 3:52 pmFollowed by: 8 members; Thanked: 11 times

by gmattesttaker2 » Sat Aug 17, 2013 9:17 pm

Hello,

Can you please assist with this? This is from MGMAT:

It takes Amy between 6 and 7 minutes to grill a steak, and she can only grill one steak at a time. She does not need to take breaks between steaks. Can Amy finish grilling all the steaks needed for her party before her guests arrive?

(1) Amy needs to grill four steaks for her party.

(2) Amy's guests will arrive in 25 to 30 minutes.

Sorry, I don't have the OA. I thought it should be E

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Source: Beat The GMAT — Data Sufficiency | Sat Aug 17, 2013 9:17 pm

krishnapavan: Senior | Next Rank: 100 Posts; Posts: 36; Joined: Wed May 15, 2013 9:42 pmFollowed by: 1 member; Thanked: 4 times

by krishnapavan » Sun Aug 18, 2013 1:07 am

whats wrong with C.

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GMATGuruNY: GMAT Instructor; Posts: 15539; Joined: Tue May 25, 2010 12:04 pmFollowed by: 1906 members; Location: New York, NY; Thanked: 13060 times; GMAT Score:790

by GMATGuruNY » Sun Aug 18, 2013 4:07 am

gmattesttaker2 wrote:Hello,

Can you please assist with this? This is from MGMAT:

It takes Amy between 6 and 7 minutes to grill a steak, and she can only grill one steak at a time. She does not need to take breaks between steaks. Can Amy finish grilling all the steaks needed for her party before her guests arrive?

(1) Amy needs to grill four steaks for her party.

(2) Amy's guests will arrive in 25 to 30 minutes.

The following cases satisfy both statements.

Worst-case scenario: GREATEST possible time per steak + EARLIEST possible arrival time.
Greatest possible time for 4 steaks = 7*4 = 28 minutes.
Earliest possible arrival time = 25 minutes.
In this case, the steaks are not grilled on time.

Best-case scenario: LEAST possible time per steak + LATEST possible arrival time.
Least possible time for 4 steaks = 6*4 = 24 minutes.
Latest possible arrival time = 30 minutes.
In this case, the steaks are grilled on time.

Thus, the two statements combined are INSUFFICIENT.

The correct answer is E.

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