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The number of prime numbers between 10 and 20

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Carcass
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The number of prime numbers between 10 and 20 [#permalink] New post   24 Jun 2019, 11:18
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Quantity A
Quantity B
The number of prime numbers between 10 and 20
The number of prime numbers between 30 and 40


A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
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A
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GreenlightTestPrep
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Re: The number of prime numbers between 10 and 20 [#permalink] New post   25 Jun 2019, 05:14
Carcass wrote:
Quantity A
Quantity B
The number of prime numbers between 10 and 20
The number of prime numbers between 30 and 40


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


Some primes: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41,....

There are 4 primes (11, 13, 17, and 19) between 10 and 20
There are 2 primes (31, 37) between 30 and 40

We get:
QUANTITY A: 4
QUANTITY B: 2

Answer: A

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Re: The number of prime numbers between 10 and 20 [#permalink] New post   17 Sep 2019, 10:19
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If one can remember 44 223 223 21
Then you know the number of primes for each row of numbers, for the 1's through all the tens.
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The number of prime numbers between 10 and 20 [#permalink] New post   18 Jul 2022, 08:44
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Quantity A: The number of prime numbers between 10 and 20

Prime numbers between 10 and 20 are 11, 13, 17, 19 => 4

Quantity B: The number of prime numbers between 30 and 40

Prime numbers between 30 and 40 are 31, 37=> 2

Clearly, Quantity A(4) > Quantity B(2)

So, Answer will be A.
Hope it helps!

Watch the following video to learn How to find Prime Numbers from 1 to 100

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The number of prime numbers between 10 and 20 [#permalink]
18 Jul 2022, 08:44
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