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: URGENT help required, OG 13 questions [#permalink]

Show Tags

08 Apr 2013, 10:41

rajrj17 wrote:

Q2) the price of lunch for 15 people was $207.00, including a 15% gratuity for service. What was the average price per person EXCLUDING the gratuity? a)11.73 b)12 c)13.8 d)14 e)15.87

Here the word EXCLUDING is used. So 0.15 * 207=$31.05 Therefore,207-31.05=$175.95

So the average cost per person=175.75/15=11.73 So ans should be (A) IMO.

the stem before the question states that 207 INCLUDES 15% gratuity. hence 1.15x = 207 and bill (without gratuity) would have only been 180. add 15% gratuity and that arrives at the total bill for 207. now the question asked is to calculate amount per person EXCLUDING gratuity which is per person share of $180 bill that will be $12 when shared equally between 15 people)

Re: URGENT help required, OG 13 questions [#permalink]

Show Tags

08 Apr 2013, 10:42

you guys are amazing! thank you so much! I've actually recently finished the whole of OG13 PS, so I just posted my questions. Q1) D Q2) B Q3) B Q4) D Q5) D Q6)E Q7) D Q8)D Q9) B

Re: URGENT help required, OG 13 questions [#permalink]

Show Tags

08 Apr 2013, 22:26

1

This post received KUDOS

[quote="Zarrolou"]That's a lot of questions !

Q1)A ladder of a fire truck is elevated to an angle of 60 degrees and extended to a length of 70 feet. if the base of the ladder is 7 fet above the ground, how many feet above the ground does the ladder reach?

The ladder forms a 30 60 90, triangle which has dimentions 1x \(\sqrt{3}\) 2, the hip is \(70=2x\) so \(x=35\), the H of the triangle is \(35\sqrt{3}\), but the ladder is 7 feet from the ground => it reaches [m]7+35[squar

I dont understand how youve put hyp=2x. Hyp is opp the 90 deg angle, so shouldnt ishould we put it equal to under root three? I dont understand OGs explanation

Re: URGENT help required, OG 13 questions [#permalink]

Show Tags

08 Apr 2013, 22:37

Zarrolou wrote:

Q3) for any psitive integer n, the sum fo the first n positive integers equals [n(n+1)]/2. what si the sum of all the even integers betwen 99 and 301?

100 ... 200 ... 300 Between 200 and 100 there are 200/2-100/2+1=51 even integers Between 300 and 200 there are 300/2-200/2+1=51 even integers But we counted 200 twice, so tot even entegers = \(51+51-1=101.\) As you can see their mean is 200 So tot sum is\(200*101=20200\) IMO B

Why are you adding one both times for even integers?

Re: URGENT help required, OG 13 questions [#permalink]

Show Tags

08 Apr 2013, 22:45

usre123 wrote:

Zarrolou wrote:

Q3) for any psitive integer n, the sum fo the first n positive integers equals [n(n+1)]/2. what si the sum of all the even integers betwen 99 and 301?

100 ... 200 ... 300 Between 200 and 100 there are 200/2-100/2+1=51 even integers Between 300 and 200 there are 300/2-200/2+1=51 even integers But we counted 200 twice, so tot even entegers = \(51+51-1=101.\) As you can see their mean is 200 So tot sum is\(200*101=20200\) IMO B

Why are you adding one both times for even integers?

It`s the formula. let me give you an example, between 4 and 8 there are 3 even numbers (4,6,8). If you don t add 1, you obtain 8/2=4 4/2=2 so 4-2=2 and not 3. That`s why you have to add one.
_________________

It is beyond a doubt that all our knowledge that begins with experience.

Re: URGENT help required, OG 13 questions [#permalink]

Show Tags

08 Apr 2013, 22:50

usre123 wrote:

Zarrolou wrote:

That's a lot of questions !

Q1)A ladder of a fire truck is elevated to an angle of 60 degrees and extended to a length of 70 feet. if the base of the ladder is 7 fet above the ground, how many feet above the ground does the ladder reach?

I dont understand how youve put hyp=2x. Hyp is opp the 90 deg angle, so shouldnt ishould we put it equal to under root three? I dont understand OGs explanation

The proportions in a 30 60 90 are 1x:\(x\sqrt{3}\):2x. The text says that "it extends for 70 feet", and this side is opposite to the right angle and therefore the longest one and therefore ( because \(2>\sqrt{3}\)) equals 2x. Now that you have x, you can obtain all the sides. Hope it s clear now
_________________

It is beyond a doubt that all our knowledge that begins with experience.

Q1)A ladder of a fire truck is elevated to an angle of 60 degrees and extended to a length of 70 feet. if the base of the ladder is 7 fet above the ground, how many feet above the ground does the ladder reach? a) 35 b) 42 c) 35 \sqrt{3} d) 7+ 35\sqrt{3} e) 7+42\sqrt{3} ...

Its been long time coming. I have always been passionate about poetry. It’s my way of expressing my feelings and emotions. And i feel a person can convey...

Written by Scottish historian Niall Ferguson , the book is subtitled “A Financial History of the World”. There is also a long documentary of the same name that the...

Post-MBA I became very intrigued by how senior leaders navigated their career progression. It was also at this time that I realized I learned nothing about this during my...