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Re: If x and y are positive integers, is (2 + x)/(3 + y) greater [#permalink]

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12 Mar 2013, 04:08

7

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Expert's post

If x and y are positive integers, is (2 + x)/(3 + y) greater than (2 + y)/(3 + x)?

Is \(\frac{2 + x}{3 + y}>\frac{2 + y}{3 + x}\)? Since both denominators are positive we can safely cross-multiply. Though we can solve the question without doing that.

(1) x + y = 3. If x=1 and y=2, then the answer is NO (3/5<4/4) but if x=2 and y=1, then the answer is YES (4/4>3/5). Not sufficient.

(2) x > y. This implies that the numerator of LHS is more than the numerator of RHS, and the denominator of LHS is less than the denominator of RHS, which means that LHS > RHS. Sufficient.

Re: If x and y are positive integers, is (2 + x)/(3 + y) greater [#permalink]

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17 Mar 2013, 08:36

Bunuel wrote:

If x and y are positive integers, is (2 + x)/(3 + y) greater than (2 + y)/(3 + x)?

Is \(\frac{2 + x}{3 + y}>\frac{2 + y}{3 + x}\)? Since both denominators are positive we can safely cross-multiply. Though we can solve the question without doing that.

(1) x + y = 3. If x=1 and y=2, then the answer is NO (3/5<4/4) but if x=2 and y=1, then the answer is YES (4/4>3/5). Not sufficient.

(2) x > y. This implies that the numerator of LHS is more than the numerator of RHS, and the denominator of LHS is less than the denominator of RHS, which means that LHS > RHS. Sufficient.

Answer: B.

Hope it's clear.

Dear Bunuel,

Can you please elaborate on an Algebra approach?

So far I'd go like this:

Since we know that the denominators are positive, we can cross multiply:

\(x^2+5x<y^2+5y\)

\(x^2-y^2<5y-5x\)

\((x+y)(x-y)<5(y-x)\)

\((x+y)(x-y)<-5(x-y)\)

Here, can we divide by (x-y)? If not, how to continue?

Re: If x and y are positive integers, is (2 + x)/(3 + y) greater [#permalink]

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18 Mar 2013, 22:57

Not sure if you would really like to take the algebra approach.

The question is pretty much clear about the usage of positive integer. So lets take a small set of positive integers {1,2,3,4}

Now, for us to get 2+x > 3+y we need to have only x>y; thats the only condition which can help us solve the equation. Since, that's given in B! Hence, B is the answer _________________

Re: If x and y are positive integers, is (2 + x)/(3 + y) greater [#permalink]

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20 Mar 2013, 03:02

[quote="fozzzy"]If x and y are positive integers, is (2 + x)/(3 + y) greater than (2 + y)/(3 + x)?

(1) x + y = 3 (2) x > y

x,y +ve intigers

from 1

x,y are in fact 1,2 but we dont know which is which...insuff

from 2

if x>y then : numerator 2+x >2+y ( numerator of each side) and 3+y<3+x (denominator of each side), thus larger numerator/smaller denominator is surely > smaller numerator/ larger denominator ..hope this makes sense

Re: If x and y are positive integers, is (2 + x)/(3 + y) greater [#permalink]

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20 Mar 2013, 05:06

3

This post received KUDOS

Expert's post

LGOdream wrote:

Bunuel wrote:

If x and y are positive integers, is (2 + x)/(3 + y) greater than (2 + y)/(3 + x)?

Is \(\frac{2 + x}{3 + y}>\frac{2 + y}{3 + x}\)? Since both denominators are positive we can safely cross-multiply. Though we can solve the question without doing that.

(1) x + y = 3. If x=1 and y=2, then the answer is NO (3/5<4/4) but if x=2 and y=1, then the answer is YES (4/4>3/5). Not sufficient.

(2) x > y. This implies that the numerator of LHS is more than the numerator of RHS, and the denominator of LHS is less than the denominator of RHS, which means that LHS > RHS. Sufficient.

Answer: B.

Hope it's clear.

Dear Bunuel,

Can you please elaborate on an Algebra approach?

So far I'd go like this:

Since we know that the denominators are positive, we can cross multiply:

x^2+5x<y^2+5y

\(x^2-y^2<5y-5x\)

\((x+y)(x-y)<5(y-x)\)

\((x+y)(x-y)<-5(x-y)\)

Here, can we divide by (x-y)? If not, how to continue?

First of all, is (2 + x)/(3 + y) greater than (2 + y)/(3 + x)? Means is \(\frac{2 + x}{3 + y}>\frac{2 + y}{3 + x}\)?

Cross-multiply: is \((2+x)(3+x)>(2+y)(3+y)\) --> is \(5x+x^2>5y+y^2\)? --> is \((x-y)(x+y)>-5(x-y)\)? Here we cannot divide by x-y, since we don't know whether it's positive or negative.

What we can do is: \((x-y)(x+y)>-5(x-y)\)? --> \((x-y)(x+y)+5(x-y)>0\)? --> \((x-y)(x+y+5)>0\)?

(1) x + y = 3. The question becomes: is \((x-y)(3+5)>0\)? --> is \(x-y>0\)? We don't know that, thus this statement is not sufficient.

(2) x > y --> \(x-y>0\). So, we can reduce by x-y and the question becomes: is \(x+y+5>0\)? Since x and y are positive then the answer to this question is YES. Sufficient.

Re: If x and y are positive integers, is (2 + x)/(3 + y) greater [#permalink]

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08 Jun 2014, 06:37

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Re: If x and y are positive integers, is (2 + x)/(3 + y) greater [#permalink]

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11 Jun 2015, 14:20

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