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The numerator of a fraction is multiple of two numbers. One of the

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New post 12 Nov 2017, 06:25
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The numerator of a fraction is multiple of two integers. One of the numbers is greater than the other by 2. If the greater number is smaller than the denominator by 4, what will be the minimum value of the fraction ?

(1) -1
(2) \(\frac{-1}{5}\)
(3) 0
(4) \(\frac{1}{5}\)
(5) 1


source - formatting, adding OA and reposting Q from other subforum

_________________

1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


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Re: The numerator of a fraction is multiple of two numbers. One of the  [#permalink]

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New post 12 Nov 2017, 06:26
chetan2u wrote:
The numerator of a fraction is multiple of two numbers. One of the numbers is greater than the other by 2. If the greater number is smaller than the
denominator by 4, what will be the minimum value of the fraction ?
(1) -1
(2) \(\frac{-1}{5}\)
(3) 0
(4) \(\frac{1}{5}\)
(5) 1


source - formatting, adding OA and reposting Q from other subforum


let the denominator be x, therefore the numerator will be (x-4)(x-6)
fraction = \(\frac{(x-4)(x-6)}{x}\)

what does (x-4)(x-6) tell you
1) It tells us that x<4 and x>6, both terms will be negative and the value will be positive.
2) At 4 and 6 it will be 0
3) AND at x as 5, the value will be NEGATIVE
so lowest value will be at x = 5
\(\frac{(x-4)(x-6)}{x}=\frac{(5-4)(5-6)}{5}=\frac{-1}{5}\)

B
_________________

1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


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Re: The numerator of a fraction is multiple of two numbers. One of the  [#permalink]

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New post 25 Nov 2017, 07:22
Consider the integers are -3 and -1. So, the numerator can be -3 since it is a multiple of both these integers. And the denominator would be -1+4=3. So the fraction becomes -3/3 = -1, which is lower than -1/5.

Am I wrong?
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The numerator of a fraction is multiple of two numbers. One of the  [#permalink]

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New post 25 Nov 2017, 11:50
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chetan2u wrote:
The numerator of a fraction is multiple of two integers. One of the numbers is greater than the other by 2. If the greater number is smaller than the denominator by 4, what will be the minimum value of the fraction ?

(1) -1
(2) \(\frac{-1}{5}\)
(3) 0
(4) \(\frac{1}{5}\)
(5) 1


plug-in approach:
let x=lesser integer
x(x+2)/x+6=-1➡
x^2+3x+6=0
no, x can't be integer
x(x+2)/x+6=-1/5➡
5x^2+11x+6=0➡
(5x+6)(x+1)=0
x=-1
-1(-1+2)/(-1+6)=-1/5
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Re: The numerator of a fraction is multiple of two numbers. One of the  [#permalink]

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New post 25 Nov 2017, 14:11
chetan2u wrote:
chetan2u wrote:
The numerator of a fraction is multiple of two numbers. One of the numbers is greater than the other by 2. If the greater number is smaller than the
denominator by 4, what will be the minimum value of the fraction ?
(1) -1
(2) \(\frac{-1}{5}\)
(3) 0
(4) \(\frac{1}{5}\)
(5) 1


source - formatting, adding OA and reposting Q from other subforum


let the denominator be x, therefore the numerator will be (x-4)(x-6)
fraction = \(\frac{(x-4)(x-6)}{x}\)

what does (x-4)(x-6) tell you
1) It tells us that x<4 and x>6, both terms will be negative and the value will be positive.
2) At 4 and 6 it will be 0
3) AND at x as 5, the value will be NEGATIVE
so lowest value will be at x = 5
\(\frac{(x-4)(x-6)}{x}=\frac{(5-4)(5-6)}{5}=\frac{-1}{5}\)

B


If I let x = -1 in the equation from the quoted solution, then the constructed fraction works out to -35, which is smaller than any of the answer choices. Am hoping someone can help me understand my mistake.
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Re: The numerator of a fraction is multiple of two numbers. One of the  [#permalink]

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New post 27 Nov 2017, 18:14
chetan2u But multiple of two integers is not necessarily same as product of two integers. For example, 48 may be a multiple of both 6 and 12 but not the product.
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Re: The numerator of a fraction is multiple of two numbers. One of the  [#permalink]

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New post 27 Nov 2017, 18:25
newfolder wrote:
chetan2u But multiple of two integers is not necessarily same as product of two integers. For example, 48 may be a multiple of both 6 and 12 but not the product.



hi..

there are two separate things :-
1) 48 is a multiple of 16. or 48 is a multiple of 3
2) but when we say that numerator is multiple of two integers, it would generally mean product itself. yes product could also have been used instead of multiple
3) otherwise multiple of two integers does not mean anything . ONLY prime numbers are multiple of just two integers
_________________

1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


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Re: The numerator of a fraction is multiple of two numbers. One of the &nbs [#permalink] 27 Nov 2017, 18:25
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