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ynatchev: Junior | Next Rank: 30 Posts; Posts: 23; Joined: Thu Feb 07, 2013 2:51 am; Thanked: 1 times

by ynatchev » Thu Feb 28, 2013 6:09 am

Hello all,

For the past hour Ive been trying to solve the first example and the 3rd one from this link https://www.mba.com/the-gmat/nex-gen/sam ... x?next=yes

Can you guys explain them to me cause I dont get how they came up with those answers. Thanks in advance.

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Source: Beat The GMAT — Data Insights | Thu Feb 28, 2013 6:09 am

hemant_rajput: Master | Next Rank: 500 Posts; Posts: 447; Joined: Sun Apr 22, 2012 7:13 amFollowed by: 13 members; Thanked: 46 times; GMAT Score:700

by hemant_rajput » Thu Feb 28, 2013 8:55 am

ynatchev wrote:Hello all,

For the past hour Ive been trying to solve the first example and the 3rd one from this link https://www.mba.com/the-gmat/nex-gen/sam ... x?next=yes

Can you guys explain them to me cause I dont get how they came up with those answers. Thanks in advance.

I've doubt about the question. Question says 300 surveyed student, but I can see 11 symbols in first circle. Where am interpreting incorrectly?

I'm no expert, just trying to work on my skills. If I've made any mistakes please bear with me.

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GMAT/MBA Expert

Tommy Wallach: GMAT Instructor; Posts: 451; Joined: Thu Jan 21, 2010 11:58 amFollowed by: 120 members; Location: New York City; Thanked: 188 times; GMAT Score:770

by Tommy Wallach » Thu Feb 28, 2013 11:11 am

Hey Guys,

You both seem to be missing the symbols above the circles. Remember, two overlapping sets require four locations: People in only group 1, People in only group 2, People in both, People in neither. If you count all these, you'll find 30 things.

Question #1: The Symbols up top represent Under 30s with a high school diploma. So all of them would meet the criteria stipulated. Actually, the only place that won't meet the criteria is the overlap between the two circles. Why? Because everything in the left circle (excluding the overlap) is an over 30 with a diploma, and everything in the right circle (excluding the overlap) is an under 30 without a diploma. So the only people we don't count are in the overlap. That's 50 people, or 1/6 of the total. The correct answer is 5/6.

Question #2: This is nice and easy. This is just the symbols up top, of which there are 10, or 1/3 of our total.

Hope that helps!

-t

Tommy Wallach, Company Expert
ManhattanGMAT

If you found this posting mega-helpful, feel free to thank and/or follow me!

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ynatchev: Junior | Next Rank: 30 Posts; Posts: 23; Joined: Thu Feb 07, 2013 2:51 am; Thanked: 1 times

by ynatchev » Fri Mar 01, 2013 1:06 am

Thanks for the answer Tommy actually i just couldnt get where the 5/6 came from but I get it now. I did some silly calculation. I got the second question 1/3 right

Can you please answer also the questions about the Tyrannosaurus rex graph(practice question 3). Cause I don't seem to get the right answer. Thanks in advance

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