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# If x and y are positive numbers, is (x + 1)/(y + 1) > x/y

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If x and y are positive numbers, is (x + 1)/(y + 1) > x/y [#permalink]

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26 Jun 2017, 01:33
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If x and y are positive numbers, is $$\frac{x + 1}{y + 1} > \frac{x}{y}$$?

(1) x > 1
(2) x < y
[Reveal] Spoiler: OA

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Re: If x and y are positive numbers, is (x + 1)/(y + 1) > x/y [#permalink]

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26 Jun 2017, 01:40
x+1/y+1>x/y
cross multiply
xy +y > xy + x
subtract xy from both sides
y > x or x<y?

Ans B.

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Re: If x and y are positive numbers, is (x + 1)/(y + 1) > x/y [#permalink]

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26 Jun 2017, 01:57
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If x and y are positive numbers, is $$\frac{x + 1}{y + 1} > \frac{x}{y}$$?

x & y are POSITIVE numbers

$$\frac{x + 1}{y + 1} > \frac{x}{y}$$

Lets simplify the equation, as we are given that x & y are positive integers we can multiply the R.H.S. with the L.H.S. as there will not be any impact on the inequality SIGN of the equation.

$$(x + 1) * (y) > (y + 1) * (x)$$

$$xy + y > xy + x$$

Cancelling $$xy$$ from both the sides.

$$y > x$$

So we want to answer, Is $$y > x$$ ?

(1) $$x > 1$$

This does not tell us anything about y. Hence, Eq. (1) =====> NOT SUFFICIENT

(2) $$x < y$$

We can write it as y > x, this is what we have to prove. Hence, Eq. (2) =====> SUFFICIENT

You liked the solution, 1 Kudos Please!
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Re: If x and y are positive numbers, is (x + 1)/(y + 1) > x/y [#permalink]

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26 Jun 2017, 07:10
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Bunuel wrote:
If x and y are positive numbers, is $$\frac{x + 1}{y + 1} > \frac{x}{y}$$?

(1) x > 1
(2) x < y

Target question: Is (x + 1)/(y + 1) > x/y ?

Given: x and y are positive numbers

This is a great candidate for rephrasing the target question.

We have the inequality: (x + 1)/(y + 1) > x/y
Since y is positive, we can multiply both sides of the inequality by y
Likewise, since y is positive, we know that y+1 is positive, which means we can multiply both sides of the inequality by (y+1)
When perform both of these multiplications we get: (x + 1)(y) > (x)(y + 1)
Expand to get: xy + y > xy + x
Subtract xy from both sides to get: y > x
REPHRASED target question: Is y > x ?

Statement 1: x > 1
There's no information about y, so there's no way to determine whether or not y > x
Since we cannot answer the REPHRASED target question with certainty, statement 1 is NOT SUFFICIENT

Statement 2: x < y
Perfect!!!
Since we can answer the REPHRASED target question with certainty, statement 2 is SUFFICIENT

[Reveal] Spoiler:
B

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26 Jun 2017, 08:04
Might as well share that I picked C due to not Reading that x and y - positive. This would not allow crossmultiplication.

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If x and y are positive numbers, is (x + 1)/(y + 1) > x/y [#permalink]

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26 Jun 2017, 08:30
x and y are positive numbers
$$x,y>0 ; (x+1)y>(y+1)x ; y>x$$

(1) x > 1
X can be a proper fraction or improper fraction and y can be proper or improper fraction
NS
(2) x < y
Rephrased expression
Suff

Option B
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Re: If x and y are positive numbers, is (x + 1)/(y + 1) > x/y [#permalink]

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15 Nov 2017, 16:27
Bunuel wrote:
If x and y are positive numbers, is $$\frac{x + 1}{y + 1} > \frac{x}{y}$$?

(1) x > 1
(2) x < y

We are given that x and y are positive numbers and need to determine whether (x + 1)/(y + 1) > x/y. Simplifying the question, we have:

Is y(x + 1) > x(y + 1)? (Note that we multiplied each side by y(y + 1), which is allowed because y > 0.)

Is yx + y > xy + x?

Is y > x?

Statement One Alone:

x > 1

Since we do not know anything about y, statement one alone is not sufficient to answer the question.

Statement Two Alone:

x < y

We see that statement two has answered the question; y is greater than x.

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Re: If x and y are positive numbers, is (x + 1)/(y + 1) > x/y   [#permalink] 15 Nov 2017, 16:27
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# If x and y are positive numbers, is (x + 1)/(y + 1) > x/y

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