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30 people were invited to a dinner party. If 17 of the guest [#permalink]

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09 Dec 2012, 03:34

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Q1: 30 people were invited to a dinner party. If 17 of the guests fed on meal A, 15 on meal B, and 20 on meal C, what is the least number of people that could feed on all three meals?

A. 2 B. 3 C. 5 D. 6 E. 8

Q2 (related to Q1, with same options): Supposing meal A=25, meal B=21, and meal C=20, but still with 30 total people. What is the minimum number of people who eat all three meals?

A.2 B.3 C.5 D.6 E. 8

What are the specific clue to take rather than simply picking the smallest of the numbers in the option? Kindly elaborate on ur strategy.
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Last edited by Bunuel on 09 Dec 2012, 06:15, edited 2 times in total.

Re: 30 people were invited to a dinner party [#permalink]

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09 Dec 2012, 05:26

You can simplify the problem by considering below scenario. "30 people, invited to a dinner party. Inviter has three different types of meal pases- A, B, C. He is going to distribute these in such that no one gets multiple passes of same type and least number of get all three passes."

In this question, answer is whatever number that is surplus of 60 i.e. (30 X 2).

Q 1) People=30 A= 17 B= 15 C= 20 Answer is 0. but to chose the least option in the given choices, I would choose 2 i.e. option A.

Q 2) People =30 A= 25 B=21 C=20 least number of people, who get 3 passes= = (25+21+20)- 60 = 6 Answer is 6. Option D.

Below is one more similar analogy that will help to understand the problems. There are 30 boxes placed in a row. You have three types of marbles- A, B & C. You are told place such that, no box hold 2 marbles of same type and least number of boxes should hold all types of marbles.

Consider below image of puts and marbles places inside.

Attachments

File comment: Analogy of marbles for the question.

Re: 30 people were invited to a dinner party. If 17 of the guest [#permalink]

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11 Dec 2012, 05:39

[quote="gmatbull"]Q1: 30 people were invited to a dinner party. If 17 of the guests fed on meal A, 15 on meal B, and 20 on meal C, what is the least number of people that could feed on all three meals?

A. 2 B. 3 C. 5 D. 6 E. 8

Ans. We calculate people having only meal A , only meal B , only meal C and add them to 30. Then from the options the number giving us the least integer value is 2. Therefore the answer is (A).
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Re: 30 people were invited to a dinner party. If 17 of the guest [#permalink]

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14 Aug 2013, 23:36

I think zero.

If we feed more than 23 in third group then only overlapping will occur in all three.

Attachment:

Solution1I.jpg [ 18.54 KiB | Viewed 1517 times ]

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Piyush K ----------------------- Our greatest weakness lies in giving up. The most certain way to succeed is to try just one more time. ― Thomas A. Edison Don't forget to press--> Kudos My Articles: 1. WOULD: when to use?| 2. All GMATPrep RCs (New) Tip: Before exam a week earlier don't forget to exhaust all gmatprep problems specially for "sentence correction".

Last edited by PiyushK on 14 Aug 2013, 23:47, edited 2 times in total.

Re: 30 people were invited to a dinner party. If 17 of the guest [#permalink]

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14 Aug 2013, 23:39

Is it a GMAT level question?
_________________

Piyush K ----------------------- Our greatest weakness lies in giving up. The most certain way to succeed is to try just one more time. ― Thomas A. Edison Don't forget to press--> Kudos My Articles: 1. WOULD: when to use?| 2. All GMATPrep RCs (New) Tip: Before exam a week earlier don't forget to exhaust all gmatprep problems specially for "sentence correction".

Re: 30 people were invited to a dinner party. If 17 of the guest [#permalink]

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19 Aug 2013, 16:44

Galiya wrote:

PiyushK what is your method? i"ve never seen anything like this?

Hi Galiya,

This method is same as described above by umeshpatil, I am fixing the position of 30 people and distributing resources in descending order like 20-17-15, like first meal C from left to right 10 people left, then Meal A from right to left 13 people left on the right side, then distribution of meal B to first those who got only one meal to minimize chances of overlapping of three meals to a single person.

Thus in the diagram you can see we are short of 8+ meals to get a person who can have all three meals.

Therefore, the least number of people is zero, from answer choices we can select 2 bcz that is the least option available.

I hope explanation clarifies the method.
_________________

Piyush K ----------------------- Our greatest weakness lies in giving up. The most certain way to succeed is to try just one more time. ― Thomas A. Edison Don't forget to press--> Kudos My Articles: 1. WOULD: when to use?| 2. All GMATPrep RCs (New) Tip: Before exam a week earlier don't forget to exhaust all gmatprep problems specially for "sentence correction".

Re: 30 people were invited to a dinner party. If 17 of the guest [#permalink]

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28 Nov 2013, 02:00

I think this question is a brain twister, and it can help you to develop a thought process, which you can further use in various other solutions. Yes it is not a GMAT type question, but I liked it.
_________________

Piyush K ----------------------- Our greatest weakness lies in giving up. The most certain way to succeed is to try just one more time. ― Thomas A. Edison Don't forget to press--> Kudos My Articles: 1. WOULD: when to use?| 2. All GMATPrep RCs (New) Tip: Before exam a week earlier don't forget to exhaust all gmatprep problems specially for "sentence correction".