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If y is the smallest positive integer such that 3,150

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If y is the smallest positive integer such that 3,150 [#permalink] New post 12 Jun 2008, 04:00
00:00
A
B
C
D
E

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Question Stats:

77% (01:53) correct 22% (01:31) wrong based on 135 sessions
If y is the smallest positive integer such that 3,150 multiplied by y is the square of an integer, then y must be

A. 2
B. 5
C. 6
D. 7
E. 14
[Reveal] Spoiler: OA

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Last edited by Bunuel on 12 Jun 2013, 03:33, edited 3 times in total.
Added the OA
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Re: PS - S26 q30 [#permalink] New post 13 Jun 2008, 03:35
IMO E should be the answer for this

i just tried plugging in the numbers and found out that

14*3150 = 44, 100, which is a square of 210

HTH
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Re: If y is the smallest positive integer such that 3,150 [#permalink] New post 28 Jan 2012, 16:42
answer E. factor out the number and find any prime numbers that are not paired. 7 & 2.
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Re: If y is the smallest positive integer such that 3,150 [#permalink] New post 28 Jan 2012, 17:00
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mrwaxy wrote:
If y is the smallest positive integer such that 3,150 multiplied by y is the square of an integer, then y must be
A. 2
B. 5
C. 6
D. 7
E. 14

Detailed explanation would be appreciated.


3,150=2*3^2*5^2*7, now 3,150*y to be a perfect square y must complete the odd powers of 2 and 7 to even number (perfect square has even powers of its primes), so the least value of y is 2*7=14. In this case 3,150y=(2*3^2*5^2*7)*(2*7)=(2*3*5*7)^2=perfect \ square.

Answer: E.

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Re: If y is the smallest positive integer such that 3,150 [#permalink] New post 30 Jan 2012, 08:46
factorise 3150, to find out the missing doubles... 3150 = 5x5x3x3x2x7... so 2x7=14... when multiplied to 3150, will make it a perfect square... answere is E
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Re: If y is the smallest positive integer such that 3,150 [#permalink] New post 12 Jun 2013, 04:25
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Re: If y is the smallest positive integer such that 3,150 [#permalink] New post 13 Jun 2013, 01:07
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mrwaxy wrote:
If y is the smallest positive integer such that 3,150 multiplied by y is the square of an integer, then y must be

A. 2
B. 5
C. 6
D. 7
E. 14


In such questions we need to break the number into the smallest possible prime factors. So the smallest prime factors of 3150 are:
315*10=63*5*2*5=7*9*5*2*5=7*3*3*5*2*5. In order to get a square of an integer we have to have at least two identical primes. In our case we have 3*3 and 5*5 corresponding to this condition but not 2*7 so our smallest number should be 14.

Answer is E
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if y is the smallest positive interger such that 3150 multip [#permalink] New post 29 Aug 2013, 00:30
if y is the smallest positive interger such that 3150 multiplied by y is the square of an interger, that Y must be

A) 2
B) 5
C) 6
D) 7
E) 14


Kindly Explain.
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Re: if y is the smallest positive interger such that 3150 multip [#permalink] New post 29 Aug 2013, 00:35
kumar83 wrote:
if y is the smallest positive interger such that 3150 multiplied by y is the square of an interger, that Y must be

A) 2
B) 5
C) 6
D) 7
E) 14


Kindly Explain.


3150 =2*3^2*5^2*7
For it to be perfect square all the prime number should be least raised to the power 2
in 3150 ...only 2 and 7 needs to be multiplied so that all prime will be raised power 2
hence least value of 4y = 2*7 = 14

hence E
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Re: if y is the smallest positive interger such that 3150 multip [#permalink] New post 29 Aug 2013, 00:44
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Re: if y is the smallest positive interger such that 3150 multip   [#permalink] 29 Aug 2013, 00:44
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