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If there are 664,579 prime numbers among the first 10 millio [#permalink]
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 26 Dec 2013, 09:02
D
E
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The Official Guide For GMAT® Quantitative Review, 2ND EditionIf 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
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Re: If there are 664,579 prime numbers among the first 10 millio [#permalink]
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26 Dec 2013, 09:02
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Re: If there are 664,579 prime numbers among the first 10 millio [#permalink]
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26 Dec 2013, 21:00
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664579=x/100 * 10,000,000 = approx. 6.6%
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Re: If there are 664,579 prime numbers among the first 10 millio [#permalink]
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26 Dec 2013, 22:50
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664,579 = (x/100) * 10^7;
664, 579 = x * 10^5
=> x = 664, 579/10^5 = 6.64579 ~ 6.6%
Ans is (D).
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Re: If there are 664,579 prime numbers among the first 10 millio [#permalink]
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27 Dec 2013, 01:37
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Writing\(664,579\) as \(0.66 * 10^6\)
Percentage of prime numbers in 10 million numbers \(= ( (0.66 * 10^6)/(10*10^6))* 100=6.6%\)
Answer: Option (D)
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Re: If there are 664,579 prime numbers among the first 10 millio [#permalink]
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30 Dec 2013, 05:14
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
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Re: If there are 664,579 prime numbers among the first 10 millio [#permalink]
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02 Jan 2014, 05:56
10 million is 10 x 10^6 = 10^7 (664 579/10^7) x 10^2 = 6.6 % Answer D
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Re: If there are 664,579 prime numbers among the first 10 millio [#permalink]
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27 Aug 2014, 03:49
100,000 is 1 % of 10,000,000 hence 664,579 will be approx. 6.6% of 10,000,000.
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Re: If there are 664,579 prime numbers among the first 10 millio [#permalink]
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31 Mar 2015, 06:56
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%
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Re: If there are 664,579 prime numbers among the first 10 millio [#permalink]
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31 Mar 2015, 11:24
Bunuel wrote: The Official Guide For GMAT® Quantitative Review, 2ND EditionIf 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 GMAT Club is introducing a new project: The Official Guide For GMAT® Quantitative Review, 2ND Edition - Quantitative Questions ProjectEach 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. Thank you! 664579/10 million = 664579/100,000,00 = 0.066 = 0.066 * 100% = 6.6% Hence option (D). -- 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
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Re: If there are 664,579 prime numbers among the first 10 millio [#permalink]
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11 Nov 2015, 14:11
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.
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Re: If there are 664,579 prime numbers among the first 10 millio [#permalink]
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12 Nov 2017, 23:20
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Re: If there are 664,579 prime numbers among the first 10 millio
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