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The least prime number greater than 24

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The least prime number greater than 24 [#permalink] New post 07 Sep 2017, 13:42
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Question Stats:

69% (00:17) correct 30% (00:08) wrong based on 149 sessions
Quantity A
Quantity B
The least prime number
greater than 24
The greatest prime number
less than 28


A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.


Practice Questions
Question: 1
Page: 110
Difficulty: easy
[Reveal] Spoiler: OA

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Re: The least prime number greater than 24 [#permalink] New post 07 Sep 2017, 13:44
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Explanation

For the integers greater than 24, note that 25, 26, 27, and 28 are not prime numbers, but 29 is a prime number, as are 31 and many other greater integers.Thus, 29 is the least prime number greater than 24, and Quantity A is 29. For the integers, less than 28, note that 27, 26, 25, and 24 are not prime numbers, but 23 is a prime number, as are 19 and several other lesser integers. Thus, 23 is the greatest prime number less than 28, and Quantity B is 23. The correct answer is Choice A, Quantity A is greater.
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Re: The least prime number greater than 24 [#permalink] New post 18 Jun 2019, 14:15
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Re: The least prime number greater than 24 [#permalink] New post 25 Jun 2019, 11:36
Carcass, when it comes to these type of questions, is there an easy to figure it out, or do you just have to take the time to solve them?
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Re: The least prime number greater than 24 [#permalink] New post 25 Jun 2019, 11:43
This is a fairly easy question now that I look at it again. Carcass, could you tell us if there is an easy way to analyze such a question?

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Re: The least prime number greater than 24 [#permalink] New post 27 Aug 2019, 09:39
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Hi,

the easiest way to analyze this type of questions id to know as cold the first prime numbers up to 50 at the very òeast. No matter what.

here is important a bit of memorization. This manner, you are able to solve the question, jotting down on a paper the numbers itself, in 30 seconds.

No other way to solve it. Sometimes, write down is the fastest way to solve it. Without thinking too much.

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Re: The least prime number greater than 24 [#permalink] New post 17 Sep 2019, 02:10
The quick way I did it was listing numbers after 24: 25, 26, 27, 28, 29...

In my mind, I kept knocking off each non-prime number which left me with 29. Since the comparison was with xxxxxx LESS THAN 28, I knew 29 would be bigger.

Hope that helps!
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Re: The least prime number greater than 24 [#permalink] New post 22 Sep 2019, 01:37
A is the answer
Re: The least prime number greater than 24   [#permalink] 22 Sep 2019, 01:37
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