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Zizou4: Newbie | Next Rank: 10 Posts; Posts: 4; Joined: Sun Jan 18, 2009 6:46 am; Thanked: 1 times

by Zizou4 » Mon Feb 09, 2009 2:04 am

Can anyone help me with this one, tried venn diagram can't understand reasoning.
Thanx in advance!

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Source: Beat The GMAT — Problem Solving | Mon Feb 09, 2009 2:04 am

Uri: Master | Next Rank: 500 Posts; Posts: 229; Joined: Tue Jan 13, 2009 6:56 am; Thanked: 8 times; GMAT Score:700

by Uri » Mon Feb 09, 2009 2:36 am

the question should say that 3/5 th of the students answered only Q1 correctly and 4/5th of the reminder answered only Q2 correctly. And nobody answered both Q wrong.
In that case, we know, 30 answered Q1 correctly and 16 answered Q2 correctly. Thus, 50-(30+16) = 4 students answered both Q correctly.

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