GMAT prep inequality 2

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jkelk: Junior | Next Rank: 30 Posts; Posts: 24; Joined: Mon Mar 12, 2012 3:05 am

by jkelk » Wed Mar 14, 2012 2:41 am

Hi

Please help solve the attached

Thanks,
J

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Source: Beat The GMAT — Problem Solving | Wed Mar 14, 2012 2:41 am

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Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members; Location: Milpitas, CA; Thanked: 1854 times; GMAT Score:770

by Anurag@Gurome » Wed Mar 14, 2012 4:49 am

jkelk wrote:Hi

Please help solve the attached

Thanks,
J

Is x + y < 1?

(1) x < 8/9 but no info on y. So, x + y may or may not be > 1; NOT sufficient.

(2) y < 1/8 but no info on x. So, x + y may or may not be > 1; NOT sufficient.

Combining (1) and (2), add the inequalities in statements 1 and 2, x + y < (8/9 + 1/8) or x + y < 73/72
x + y < (1 + 1/72) but we do not know the exact values of x and y. So, x + y may or may not be less than 1; NOT sufficient.

The correct answer is E.

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