Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

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.

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 right-handed part of the boys or of the whole bunch of students.

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 10 The 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.

There are 40 students in a classroom, 9/20 of them are boys and 4/5 of them are right-handed. How many right-handed 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 right-handed 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 right-handed (4/5*40=32).

Maximum number of right-handed boys possible is if ALL 18 boys are right-handed; Minimum number of right-handed boys possible is if ALL 22 girls are right-handed, so in this case 32-22=10 boys would be right-handed.

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 2490 times ]

_________________

Rgds, TGC! _____________________________________________________________________ I Assisted You => KUDOS Please _____________________________________________________________________________

gmatclubot

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

Military MBA Acceptance Rate Analysis Transitioning from the military to MBA is a fairly popular path to follow. A little over 4% of MBA applications come from military veterans...

Best Schools for Young MBA Applicants Deciding when to start applying to business school can be a challenge. Salary increases dramatically after an MBA, but schools tend to prefer...

Marty Cagan is founding partner of the Silicon Valley Product Group, a consulting firm that helps companies with their product strategy. Prior to that he held product roles at...