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.

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:

5 Math Questions: Please Help [#permalink]
27 Jan 2008, 12:16

1

This post received KUDOS

Hello, can somebody please help me solve the following 5 questions. Thank you very much.

1. What is the greatest prime factor of 4^17 – 2^28? The correct answer is 7.

2. If K is a positive integer, is K the square of an integer? i) K is divisible by 4 ii) K is divisible exactly by 4 different prime numbers. The correct answer is e, statement i and ii together are NOT sufficient.

3. The symbol * represents one of four arithmetic options, plus, minus, divide, or multiply. Is (5*6)*2 = 5*(6*2)? i) 5*6 = 6*6 ii) 2*0 = 2 The correct answer is a, statement i alone is sufficient.

4. Five pieces of wood have an average length of 124 cm and a median length of 140cm. what is the maximum possible length of the shortest piece of wood? The correct answer is 100cm

5. Machine A produces pencils at a constant rate of 9000/hour. Machine B produces pencils at a constant rate of 7000/hour. If the two machines together must produce 100,000 pencils, and if each machine can operate for at most 8 hours, what is the least amount of time that machine B must operate. The correct answer is 4 hours.

Re: 5 Math Questions: Please Help [#permalink]
27 Jan 2008, 12:28

Expert's post

leizermike wrote:

2. If K is a positive integer, is K the square of an integer? i) K is divisible by 4 ii) K is divisible exactly by 4 different prime numbers. The correct answer is e, statement i and ii together are NOT sufficient.

K=2^2*3^2*5^2*7 and K=2^2*3^2*5^2*7^2 are satisfy both conditions but only one is the square of an integer. E _________________

Re: 5 Math Questions: Please Help [#permalink]
27 Jan 2008, 12:34

Expert's post

leizermike wrote:

3. The symbol * represents one of four arithmetic options, plus, minus, divide, or multiply. Is (5*6)*2 = 5*(6*2)? i) 5*6 = 6*6 ii) 2*0 = 2 The correct answer is a, statement i alone is sufficient.

I think It have to be 5*6=6*5.

(5*6)*2 = 5*(6*2) is true for "+", "*" and is false for "-", "/"

1. 5*6=6*5 is true for "+", "*". sufficient.

2. 2*0=2 is true for "+", "-".insufficient. _________________

Re: 5 Math Questions: Please Help [#permalink]
27 Jan 2008, 12:36

Expert's post

leizermike wrote:

4. Five pieces of wood have an average length of 124 cm and a median length of 140cm. what is the maximum possible length of the shortest piece of wood? The correct answer is 100cm

Re: 5 Math Questions: Please Help [#permalink]
27 Jan 2008, 12:40

Expert's post

leizermike wrote:

5. Machine A produces pencils at a constant rate of 9000/hour. Machine B produces pencils at a constant rate of 7000/hour. If the two machines together must produce 100,000 pencils, and if each machine can operate for at most 8 hours, what is the least amount of time that machine B must operate. The correct answer is 4 hours.

Re: 5 Math Questions: Please Help [#permalink]
27 Feb 2008, 22:15

walker wrote:

leizermike wrote:

5. Machine A produces pencils at a constant rate of 9000/hour. Machine B produces pencils at a constant rate of 7000/hour. If the two machines together must produce 100,000 pencils, and if each machine can operate for at most 8 hours, what is the least amount of time that machine B must operate. The correct answer is 4 hours.

Re: 5 Math Questions: Please Help [#permalink]
28 Feb 2008, 01:33

walker wrote:

leizermike wrote:

3. The symbol * represents one of four arithmetic options, plus, minus, divide, or multiply. Is (5*6)*2 = 5*(6*2)? i) 5*6 = 6*6 ii) 2*0 = 2 The correct answer is a, statement i alone is sufficient.

I think It have to be 5*6=6*5.

(5*6)*2 = 5*(6*2) is true for "+", "*" and is false for "-", "/"

1. 5*6=6*5 is true for "+", "*". sufficient. 2. 2*0=2 is true for "+", "-".insufficient.

walker, 5*6=6*5 is true for "+", "x" but how is that suff?

if * is "x", suff. if * is "+", insuff. _________________

1. 5*6=6*5: plus: (5+6) = (6+5) true multiply: (5x6) = (6x5) true minus: (5-6) = (6-5) false divide: (5/6) = (6/5) false Therefore, condition 1 points that * could be + or x. For both operations (5*6)*2 = 5*(6*2) is true. So, information is sufficient to answer the question.

Therefore, condition 2 points that * could be + or -. For each operations (5*6)*2 = 5*(6*2) can be true (+) or false (-). So, information is not sufficient to answer the question. _________________

It’s been a long time, since I posted. A busy schedule at office and the GMAT preparation, fully tied up with all my free hours. Anyways, now I’m back...

Ah yes. Funemployment. The time between when you quit your job and when you start your MBA. The promised land that many MBA applicants seek. The break that every...

It is that time of year again – time for Clear Admit’s annual Best of Blogging voting. Dating way back to the 2004-2005 application season, the Best of Blogging...