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If n is a positive integer and n^3 is a multiple of 550, what is the

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If n is a positive integer and n^3 is a multiple of 550, what is the  [#permalink]

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New post 11 Feb 2015, 06:38
1
5
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A
B
C
D
E

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84% (01:31) correct 16% (01:48) wrong based on 139 sessions

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Re: If n is a positive integer and n^3 is a multiple of 550, what is the  [#permalink]

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New post 11 Feb 2015, 07:29
Bunuel wrote:
If n is a positive integer and n^3 is a multiple of 550, what is the least possible value of n?

A. 8
B. 27
C. 81
D. 110
E. 125


Kudos for a correct solution.


cube of a number entails having 3 copies of the original prime factors. Since 550 is a facor of \(n^3\) the least possible value of n is 5(11)2 = 110 and the answer is D.
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Re: If n is a positive integer and n^3 is a multiple of 550, what is the  [#permalink]

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New post 11 Feb 2015, 22:40
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Answer = D. 110

\(550 = 2^2 * 5^1 * 11^1\)

Out of the OA, only option D has 2, 5 & 11 as the constituents.
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Re: If n is a positive integer and n^3 is a multiple of 550, what is the  [#permalink]

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New post 12 Feb 2015, 00:16
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If n is a positive integer and n^3 is a multiple of 550, what is the least possible value of n?

A. 8
B. 27
C. 81
D. 110
E. 125



Since n^3 is multiple of 550 so unit digit of n must be "0".
OA = D
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Re: If n is a positive integer and n^3 is a multiple of 550, what is the  [#permalink]

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New post 12 Feb 2015, 01:23
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IMO its D
simple.. 5^2 * 2 *11=550
k(n^3)=550
all we need 5,2 and 11
hence 110


kudos to me if its a right one
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Re: If n is a positive integer and n^3 is a multiple of 550, what is the  [#permalink]

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New post 16 Feb 2015, 05:58
Bunuel wrote:
If n is a positive integer and n^3 is a multiple of 550, what is the least possible value of n?

A. 8
B. 27
C. 81
D. 110
E. 125


Kudos for a correct solution.


VERITAS PREP OFFICIAL SOLUTION

Correct Answer: D

To begin this question, factor 550 into its primes: 550 = 2 * 5 * 5 * 11. If we multiply this number by 2 * 2 * 5 * 11 * 11, we'll have 2^3 * 5^3 * 11^3 , which is the same as (2∗5∗11)^3. This is the smallest multiple of 550 that is a perfect cube (an integer cubed) and thus n = 110.

The correct answer is D.
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Re: If n is a positive integer and n^3 is a multiple of 550, what is the  [#permalink]

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New post 25 Apr 2016, 01:48
Bunuel wrote:
Bunuel wrote:
If n is a positive integer and n^3 is a multiple of 550, what is the least possible value of n?

A. 8
B. 27
C. 81
D. 110
E. 125


Kudos for a correct solution.


VERITAS PREP OFFICIAL SOLUTION

Correct Answer: D

To begin this question, factor 550 into its primes: 550 = 2 * 5 * 5 * 11. If we multiply this number by 2 * 2 * 5 * 11 * 11, we'll have 2^3 * 5^3 * 11^3 , which is the same as (2∗5∗11)^3. This is the smallest multiple of 550 that is a perfect cube (an integer cubed) and thus n = 110.

The correct answer is D.


l was looking for an answer choice with a number greater than 550. As l knew, a multiple of any number is equal to or greater than the number itself. Could someone please clarify what l'm missing here?
Almost 90% people got this question correct. :oops: My apologies for the silly question.

Regards,
Rana
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If n is a positive integer and n^3 is a multiple of 550, what is the  [#permalink]

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New post 25 Apr 2016, 01:56
1
ranaazad wrote:
Bunuel wrote:
Bunuel wrote:
If n is a positive integer and n^3 is a multiple of 550, what is the least possible value of n?

A. 8
B. 27
C. 81
D. 110
E. 125


Kudos for a correct solution.


VERITAS PREP OFFICIAL SOLUTION

Correct Answer: D

To begin this question, factor 550 into its primes: 550 = 2 * 5 * 5 * 11. If we multiply this number by 2 * 2 * 5 * 11 * 11, we'll have 2^3 * 5^3 * 11^3 , which is the same as (2∗5∗11)^3. This is the smallest multiple of 550 that is a perfect cube (an integer cubed) and thus n = 110.

The correct answer is D.


l was looking for an answer choice with a number greater than 550. As l knew, a multiple of any number is equal to or greater than the number itself. Could someone please clarify what l'm missing here?
Almost 90% people got this question correct. :oops: My apologies for the silly question.

Regards,
Rana


Hi,
if it was N is multiple of 550, yes you should have been looking for N>550..
But here N^3 is to be made multiple of 550...
N^3 means there should be atleast three of each prime factors in it..
\(550 = 2*5^2*11\)...
so we require 2*5*11..
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Re: If n is a positive integer and n^3 is a multiple of 550, what is the  [#permalink]

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New post 25 Apr 2016, 03:01
Hi,
if it was N is multiple of 550, yes you should have been looking for N>550..
But here N^3 is to be made multiple of 550...
N^3 means there should be atleast three of each prime factors in it..
\(550 = 2*5^2*11\)...
so we require 2*5*11..[/quote]


Thank you for the instant reply! lt's understandable now. :-D
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Re: If n is a positive integer and n^3 is a multiple of 550, what is the  [#permalink]

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Re: If n is a positive integer and n^3 is a multiple of 550, what is the   [#permalink] 15 Aug 2017, 08:42
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