PDF800 SET1 question 18

Expert replies

zozo123: Senior | Next Rank: 100 Posts; Posts: 56; Joined: Tue Feb 13, 2007 6:19 am

by zozo123 » Tue Jul 31, 2007 2:30 am

On a certain transatlantic crossing, 20 percent of a ship’s passengers held round-trip tickets and also took their cars abroad the ship. If 60 percent of the passengers with round-trip tickets did not take their cars abroad the ship, what percent of the ship’s passengers held round-trip tickets?

A. 33 1/3%
B. 40%
C. 50%
D. 60%
E. 66 2/3%

Like this post

Source: Beat The GMAT — Problem Solving | Tue Jul 31, 2007 2:30 am

trandb: Newbie | Next Rank: 10 Posts; Posts: 2; Joined: Sat Jul 28, 2007 9:52 am

by trandb » Tue Jul 31, 2007 5:59 am

is C (50 %) the answer ?

Like this post

mindruna: Junior | Next Rank: 30 Posts; Posts: 27; Joined: Mon Mar 19, 2007 6:23 pm; Location: Cambridge, MA

by mindruna » Tue Jul 31, 2007 7:45 am

I would also say 50%.

The 20% of the (total) passengers hold a round trip ticket and have cars and 60% of round trip passengers have no cars. You can see that the 20% is equal to 40% of the total passengers and that means that those with round trip tickets without cars are equal to 30% of the total passengers.

30% +20%=50%

Like this post

lalitgmat: Senior | Next Rank: 100 Posts; Posts: 33; Joined: Thu Jul 05, 2007 1:28 pm

by lalitgmat » Tue Jul 31, 2007 8:58 am

If you combine all AND clauses,
1> 20% of Ships's passengers (SP) have CAR aboard.
2> 60% of SP DO NOT have CAR aboard.
Now my argue is "how are you sure that ship does NOT have any other type of passenger". Basically how you deduce that "ALL passengers of ship have round-trip tickets".

Like this post

mindruna: Junior | Next Rank: 30 Posts; Posts: 27; Joined: Mon Mar 19, 2007 6:23 pm; Location: Cambridge, MA

by mindruna » Tue Jul 31, 2007 9:02 am

I feel like you have to assume that there are no other types of passengers other than those with and without a car and those with and without round trip tickets. If not, there would be no way to solve the problem...

Like this post

gabriel: Legendary Member; Posts: 986; Joined: Wed Dec 20, 2006 11:07 amFollowed by: 1 member; Location: India; Thanked: 51 times

by gabriel » Tue Jul 31, 2007 9:16 am

... guyz .. seriously ignore this question .. the construction of the question leaves a lot of room for ambiguity ..

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

560 reviews

1168 reviews

431 reviews

359 reviews

147 reviews

5/5

5 Star (560 Reviews)

"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."

"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."

"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."

Write a Review