At a monthly meeting, 2/5 of the attendees were males and

Oldest

Best Reply

Author

Message

TAGS:

Joined: 03 Apr 2007

Posts: 1384

Followers: 2

Kudos [?]: 90 [0], given: 10

At a monthly meeting, 2/5 of the attendees were males and [#permalink]

01 Jun 2008, 09:38

00:00

Question Stats:

88% (03:14) correct

12% (00:44) wrong

based on 5 sessions

At a monthly meeting, 2/5 of the attendees were males and 7/8 of the male attendees arrived on time. If 9/10 of the female attendees arrived on time, what fraction of the attendees at the monthly meeting did not arrive on time?

A. 11/100
B. 3/25
C. 7/50
D. 3/20
E. 4/25

[Reveal] Spoiler: OA

Director

Joined: 10 Sep 2007

Posts: 958

Followers: 5

Kudos [?]: 151 [2] , given: 0

Re: PS_meeting [#permalink]

01 Jun 2008, 09:49

This post received
KUDOS

One can pick number or one can also do it without picking number depending on how comfortable one is with abstract calculations.
For picking a number choose some thing that can be evenly divided by all the denominators given in the question.
Solution by picking number
Picking nunber = 100
Males = 100*2/5 = 40
Female = 100 - 40 = 60
Males Arrived on time = 40 * 7/8 = 35
Males Not Arrived on time = 40 - 35 = 5
Females Arrived on time = 60 * 9/10 = 54
Females Not Arrived on time = 60 - 54 = 6
Total later arrivals = 6 + 5 = 11
Ratio = 11/100

Answer A.

Solution by abstract method
Total nunber = x
Males = x*2/5 = 2x/5
Female = x - 2x/5 = 3x/5
Males Not Arrived on time = 2x/5 * (1-7/8) = x/20
Females Not Arrived on time = 3x/5 * (1-9/10) = 3x/50
Total later arrivals = x/20 + 3x/50 = 11x/100
Ratio = 11x/100/x = 11/100

Answer A.

Current Student

Joined: 28 Dec 2004

Posts: 3439

Location: New York City

Schools: Wharton'11 HBS'12

Followers: 11

Kudos [?]: 134 [0], given: 2

Re: PS_meeting [#permalink]

01 Jun 2008, 09:50

i get 11/100

i picked 100 cause its a multiple of 5, 2..

Director

Joined: 23 Sep 2007

Posts: 806

Followers: 4

Kudos [?]: 66 [0], given: 0

Re: PS_meeting [#permalink]

01 Jun 2008, 11:25

I find that it is easier to draw the table and fill in the blanks, it saves a little time of having to set up the conditions in the mind

| M | F | Total
late | | |
not late | | |
total | 2/5 | 3/5 | 5/5

the table does not show like I intended for it to show

Director

Status: Gonna rock this time!!!

Joined: 22 Jul 2012

Posts: 551

Location: India

GMAT 1: 640 Q43 V34
GMAT 2: 630 Q47 V29

WE: Information Technology (Computer Software)

Followers: 1

Kudos [?]: 13 [0], given: 560

Re: At a monthly meeting, 2/5 of the attendees were males and [#permalink]

24 Nov 2012, 08:09

2/5 of the attendees were males and 7/8 of the male attendees

How to pick nos? Here it is..

LCM of 5 and 8 is 40..
So pick no 40 for no of males..

so males=2/5 of total attendees= 40

therefore total=100.

7/8 of 40= 35 arrived on time

Hope it helps

Kudos if you like this approach..
_________________

hope is a good thing, maybe the best of things. And no good thing ever dies.

Who says you need a 700 ?Check this out : http://gmatclub.com/forum/who-says-you-need-a-149706.html#p1201595

My GMAT Journey : end-of-my-gmat-journey-149328.html#p1198742

Intern

Joined: 28 Apr 2012

Posts: 18

Followers: 0

Kudos [?]: 1 [0], given: 51

Re: At a monthly meeting, 2/5 of the attendees were males and [#permalink]

02 Dec 2012, 13:00

Sachin9 wrote:

Kudos if you like this approach..

I got the answer right because after I couldn't figure it out picking numbers, I tried to solve another way but I was wondering if you could help me figure it out with picking numbers approach.

How do we know to pick numbers for males and not total attendees? I picked 40 because it went into 5, 8, and 10. Then I figured out 2/5 of males of total attendees is 16 and 7/8 of 16 on time is 14 on time which means 2 not on time.

If 2/5 were males then that means 3/5 were females so 3/5 of the 40 is 24. 9/10 of that number is approximately 21 people which is approximately 3 females not on time.

Then that would be 3 females not on time + 2 males not on time = 5 / 40= 1/8

Re: At a monthly meeting, 2/5 of the attendees were males and [#permalink] 02 Dec 2012, 13:00

		Similar topics	Author	Replies	Last post
Similar Topics:	2	At an orientation meeting, the travelers were told that a	okdongdong	14	12 Aug 2005, 07:16
		Of all the attendees at a dinner party, 40% were women. If	kidderek	3	14 Nov 2006, 14:03
		Of all the attendees at a dinner party, 40% were women. If	ggarr	1	17 Nov 2006, 15:35
		Of all the attendees at a dinner party, 40% were women. If	mm007	8	20 Dec 2006, 14:03
	2	Of all the attendees at a dinner party, 40% were women. If	enigma123	7	03 Nov 2011, 15:19

At a monthly meeting, 2/5 of the attendees were males and

Main navigation

GMAT Resources

Partners

MBA Resources

GMAT ® is a registered trademark of the Graduate Management Admission Council ® (GMAC ®). GMAT Club's website has not been reviewed or endorsed by GMAC.

GMAT Courses

Admissions Consulting

At a monthly meeting, 2/5 of the attendees were males and

At a monthly meeting, 2/5 of the attendees were males and

Main navigation

GMAT Resources

Partners

MBA Resources