Author 
Message 
TAGS:

Hide Tags

Manager
Joined: 04 Apr 2008
Posts: 215
Location: Pune

There are 40 students in a classroom, 9/20 of them are boys [#permalink]
Show Tags
22 Jun 2009, 11:04
3
This post was BOOKMARKED
Question Stats:
84% (02:01) correct
16% (01:39) wrong based on 87 sessions
HideShow timer Statistics
There are 40 students in a classroom, 9/20 of them are boys and 4/5 of them are righthanded. How many righthanded boys are there in the classroom? A. Between 10 and 32. B. Between 14 and 32. C. Between 10 and 18. D. Between 14 and 18. E. Between 18 and 36. this is a very easy problem but i am confused............ between two answers C and D
_________________
Every Problem Has a Sloution So keep working AB



Manager
Joined: 04 Apr 2008
Posts: 215
Location: Pune

Re: Unitary method problem:easy problem but confusing answer [#permalink]
Show Tags
22 Jun 2009, 18:42
even i marked this answer but it was given D as the answer???
_________________
Every Problem Has a Sloution So keep working AB



Manager
Joined: 28 Jan 2004
Posts: 203
Location: India

Re: Unitary method problem:easy problem but confusing answer [#permalink]
Show Tags
22 Jun 2009, 23:10
No. of boys = [m]40 * \frac{9}{20}[/m] =18. No. of right handed boys = 4/5 of 18 or (d) Between 14 and 18.



Senior Manager
Joined: 23 Jun 2009
Posts: 361
Location: Turkey
Schools: UPenn, UMich, HKS, UCB, Chicago

Re: Unitary method problem:easy problem but confusing answer [#permalink]
Show Tags
23 Jun 2009, 01:23
IMO the answer is C but writing of problem made it confusing. This question is will be a good sentence correction question rather than a problem solving question.



Intern
Joined: 05 Jan 2009
Posts: 5
Location: Milan

Re: Unitary method problem:easy problem but confusing answer [#permalink]
Show Tags
24 Jun 2009, 06:56
mdfrahim wrote: No. of boys = \(40 * \frac{9}{20}\) =18. No. of right handed boys = 4/5 of 18 or (d) Between 14 and 18. I did the same but reading carefully the question it looks misleading: it is not clear if the 4/5 represents the righthanded part of the boys or of the whole bunch of students.



Intern
Joined: 05 Sep 2006
Posts: 14

Re: Unitary method problem:easy problem but confusing answer [#permalink]
Show Tags
26 Jun 2009, 12:57
I got the answer as D as well. I think they made the wording confusing on purpose but accomodated it by giving a range in the answers.



Intern
Joined: 15 Apr 2012
Posts: 1

Re: Unitary method problem:easy problem but confusing answer [#permalink]
Show Tags
15 Apr 2012, 04:07
The question again is very badly worded. What they want you to work out is: that 9/20 of the class are boys = 40 x 9/20 = 18 and then 4/5 of the class are right handed = 40 x 4/5 = 32 All 18 boys could be right handed or a minimum of 10 could be right handed as 8 people in the class are left handed. If all the left handed pupils are boys then 18  8 = 10 right handers. Answer is C between 18 and 10The way they right it leads you to believe that 4/5 of the boys are right handed but you can't have 14.4 boys. The starting question needs to be alterred so it states 4/5 of the class are right handed.



Senior Manager
Joined: 13 Mar 2012
Posts: 358
Concentration: Operations, Strategy

Re: Unitary method problem:easy problem but confusing answer [#permalink]
Show Tags
15 Apr 2012, 04:47
as per the given question wording it should be C
_________________
Practice Practice and practice...!!
If my reply /analysis is helpful>please press KUDOS If there's a loophole in my analysis> suggest measures to make it airtight.



Senior Manager
Status: May The Force Be With Me (DDAY 15 May 2012)
Joined: 06 Jan 2012
Posts: 278
Location: India
Concentration: General Management, Entrepreneurship

Re: There are 40 students in a classroom, 9/20 of them are boys [#permalink]
Show Tags
15 Apr 2012, 06:04
+1 C I drew up a table & then tried solving it You have 22 girls & 18 boy out of which only 32 are right handed. You can have max girls => 22 then 10 boys Max boys => 18 then max girls => 14 girls Hence C
_________________
Giving +1 kudos is a better way of saying 'Thank You'.



Math Expert
Joined: 02 Sep 2009
Posts: 39662

Re: There are 40 students in a classroom, 9/20 of them are boys [#permalink]
Show Tags
15 Apr 2012, 06:27
apurva1985 wrote: There are 40 students in a classroom, 9/20 of them are boys and 4/5 of them are righthanded. How many righthanded boys are there in the classroom?
A. Between 10 and 32. B. Between 14 and 32. C. Between 10 and 18. D. Between 14 and 18. E. Between 18 and 36.
this is a very easy problem but i am confused............ between two answers C and D I agree that the wording of the question could have been better. For example the question should ask what is the minimum and the maximum # of righthanded boys possible, in this case the answer would be: 10 and 18. Given that there are 18 boys (9/20*40=18) and 22 girls in the class. Also we know that out of 40 students 32 are righthanded (4/5*40=32). Maximum number of righthanded boys possible is if ALL 18 boys are righthanded; Minimum number of righthanded boys possible is if ALL 22 girls are righthanded, so in this case 3222= 10 boys would be righthanded. Answer: C. Hope it's clear.
_________________
New to the Math Forum? Please read this: All You Need for Quant  PLEASE READ AND FOLLOW: 12 Rules for Posting!!! Resources: GMAT Math Book  Triangles  Polygons  Coordinate Geometry  Factorials  Circles  Number Theory  Remainders; 8. Overlapping Sets  PDF of Math Book; 10. Remainders  GMAT Prep Software Analysis  SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS)  Tricky questions from previous years.
Collection of Questions: PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.
What are GMAT Club Tests? Extrahard Quant Tests with Brilliant Analytics



Director
Joined: 03 Aug 2012
Posts: 893
Concentration: General Management, General Management
GMAT 1: 630 Q47 V29 GMAT 2: 680 Q50 V32
GPA: 3.7
WE: Information Technology (Investment Banking)

Re: There are 40 students in a classroom, 9/20 of them are boys [#permalink]
Show Tags
18 Aug 2013, 10:03
Solution Attached :
Attachments
genera.jpeg [ 19.36 KiB  Viewed 2788 times ]
_________________
Rgds, TGC! _____________________________________________________________________ I Assisted You => KUDOS Please _____________________________________________________________________________




Re: There are 40 students in a classroom, 9/20 of them are boys
[#permalink]
18 Aug 2013, 10:03







