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:
What people who reach the high 700's do differently? We're going to share insights, tips and strategies from data we collected on over 50,000 students who used examPAL.
If there are 664,579 prime numbers among the first 10 million positive integers, approximately what percent of the first 10 million positive integers are prime numbers?
(A) 0.0066% (B) 0.066% (C) 0.66% (D) 6.6% (E) 66%
Problem Solving Question: 10 Category:Arithmetic Percents Page: 63 Difficulty: 550
Each week we'll be posting several questions from The Official Guide For GMAT® Quantitative Review, 2ND Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.
We'll be glad if you participate in development of this project: 1. Please provide your solutions to the questions; 2. Please vote for the best solutions by pressing Kudos button; 3. Please vote for the questions themselves by pressing Kudos button; 4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.
Re: If there are 664,579 prime numbers among the first 10 millio
[#permalink]
Show Tags
26 Dec 2013, 08:02
1
2
SOLUTION
If there are 664,579 prime numbers among the first 10 million positive integers, approximately what percent of the first 10 million positive integers are prime numbers?
(A) 0.0066% (B) 0.066% (C) 0.66% (D) 6.6% (E) 66%
We need to find 664,579 is what percent of 10 million: \(\frac{664,579}{10,000,000}*100\approx{6.6%}\).
Re: If there are 664,579 prime numbers among the first 10 millio
[#permalink]
Show Tags
30 Dec 2013, 04:14
If there are 664,579 prime numbers among the first 10 million positive integers, approximately what percent of the first 10 million positive integers are prime numbers?
(A) 0.0066% (B) 0.066% (C) 0.66% (D) 6.6% (E) 66%
Sol: Given there 664 579 prime nos in first 10 million positive integers.So % will be
(0.664579*10^6/10 *10^6)*100 ------> 0.664579*10 and thus 6.6% Ans D
_________________
“If you can't fly then run, if you can't run then walk, if you can't walk then crawl, but whatever you do you have to keep moving forward.”
Re: If there are 664,579 prime numbers among the first 10 millio
[#permalink]
Show Tags
31 Mar 2015, 05:56
664,579 / 10,000,000 *100 =x%
you can reduce the 10 million by 100, so that you only have 100,000 in the denominator. Now, bot the nominator and denominator have the same amount of digits and from this point you can ask yourself how much for e.g. 664/100 is. The solution is 6,64 or in this case 6,6%
If there are 664,579 prime numbers among the first 10 million positive integers, approximately what percent of the first 10 million positive integers are prime numbers?
(A) 0.0066% (B) 0.066% (C) 0.66% (D) 6.6% (E) 66%
Problem Solving Question: 10 Category:Arithmetic Percents Page: 63 Difficulty: 550
Each week we'll be posting several questions from The Official Guide For GMAT® Quantitative Review, 2ND Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.
We'll be glad if you participate in development of this project: 1. Please provide your solutions to the questions; 2. Please vote for the best solutions by pressing Kudos button; 3. Please vote for the questions themselves by pressing Kudos button; 4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.
-- Optimus Prep's GMAT On Demand course for only $299 covers all verbal and quant. concepts in detail. Visit the following link to get your 7 days free trial account: http://www.optimus-prep.com/gmat-on-demand-course
Re: If there are 664,579 prime numbers among the first 10 millio
[#permalink]
Show Tags
11 Nov 2015, 13:11
You can find interesting facts and puzzles about Prime Numbers and Magic Squares, Smith Numbers, and Arithmetic and Palindromic Primes on Glenn Westmore's blog.
Re: If there are 664,579 prime numbers among the first 10 millio
[#permalink]
Show Tags
17 Nov 2018, 03:22
Hello from the GMAT Club BumpBot!
Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
close
67% (00:45) correct 
