Who types at a faster rate, John or Bob

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BTGmoderatorDC: Moderator; Posts: 7187; Joined: Thu Sep 07, 2017 4:43 pmFollowed by: 23 members

by BTGmoderatorDC » Wed Feb 28, 2018 4:23 pm

Who types at a faster rate, John or Bob?

(1) The difference between their typing rates is 1 word per minute
(2) Bob types at a rate of 80 words per minute

Which of the statements is sufficient?

OA E

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Source: Beat The GMAT — Data Sufficiency | Wed Feb 28, 2018 4:23 pm

DavidG@VeritasPrep: Legendary Member; Posts: 2663; Joined: Wed Jan 14, 2015 8:25 amFollowed by: 128 members; Location: Boston, MA; Thanked: 1153 times; GMAT Score:770

by DavidG@VeritasPrep » Wed Feb 28, 2018 5:47 pm

lheiannie07 wrote:Who types at a faster rate, John or Bob?

(1) The difference between their typing rates is 1 word per minute
(2) Bob types at a rate of 80 words per minute

Which of the statements is sufficient?

OA E

Statement 1: Knowing the difference doesn't tell us who's faster --> not sufficient
Statement 2: nothing about John --> not sufficient
Together: We know Bob types at 80 wpm, and that there's a difference of 1 wpm. So John could type at either 79 or 81 wpm --> not sufficient. The answer is E

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