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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
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Re: If there are 664,579 prime numbers among the first 10 millio
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26 Dec 2013, 09:02
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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
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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
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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%
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.
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Re: If there are 664,579 prime numbers among the first 10 millio
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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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12 Nov 2017, 23:20
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