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nidhis.1408: Master | Next Rank: 500 Posts; Posts: 135; Joined: Mon Oct 03, 2011 6:54 amFollowed by: 4 members

by nidhis.1408 » Sun Sep 30, 2012 9:14 am

Roger can eat 12 hot dogs in one minute. At this rate, how many will Roger eat in one full day if he does not fall asleep, get sick, or rest?
A. 720
B. 1532
C. 17280
D. 43200
E. 1036800

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Source: Beat The GMAT — Problem Solving | Sun Sep 30, 2012 9:14 am

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Ian Stewart: GMAT Instructor; Posts: 2623; Joined: Mon Jun 02, 2008 3:17 amFollowed by: 355 members; Location: Montreal; Thanked: 1090 times; GMAT Score:780

by Ian Stewart » Sun Sep 30, 2012 9:57 am

If he eats 12 each minute, then he eats 12*60 = 720 each hour, and 24*720 each day. I wouldn't bother multiplying that out, considering how far apart the answer choices are - a very rough estimate will do just fine here. Now 20*700 is 14,000, and 24*720 won't be too much bigger than that, so C is right.

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