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Math Expert V
Joined: 02 Sep 2009
Posts: 58320
If a < x < b and c < y < d, is x < y ?  [#permalink]

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Difficulty:   5% (low)

Question Stats: 82% (01:01) correct 18% (01:33) wrong based on 778 sessions

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The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

If a < x < b and c < y < d, is x < y ?

(1) a < c
(2) b < c

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Question: 48
Page: 279
Difficulty: 600

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Math Expert V
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Re: If a < x < b and c < y < d, is x < y ?  [#permalink]

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SOLUTION

If a < x < b and c < y < d, is x < y ?

(1) a < c. From this statement we cannot determine whether $$x < y$$. For example, consider that $$a$$ and $$c$$ are some negative numbers and $$x$$ and $$y$$ are some positive numbers, we can have that $$x<y$$ as well as $$y<x$$. Not sufficient.

(2) b < c. Since, $$b<c$$, then $$a < x < b<c < y < d$$ --> $$x<y$$. Sufficient.

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Re: If a < x < b and c < y < d, is x < y ?  [#permalink]

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1) Insufficient
2) Sufficient

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Re: If a < x < b and c < y < d, is x < y ?  [#permalink]

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1
Statement 1: A <c... insufficient...

Statement. 2 ...sufficient..because B<c.. X must be less than Y..
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Re: If a < x < b and c < y < d, is x < y ?  [#permalink]

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Bunuel wrote:
If a < x < b and c < y < d, is x < y ?

(1) a < c
(2) b < c

x < y?

(1)
a < x < b
c < y < d
and a < c
these 2 eqns can be combined in multiple ways

a...x...b...c...y...d
or
a...c..y...d...x..b
etc.
Thus, x can be greater or lesser than y
So, this is not sufficient

(2)
a < x < b
c < y < d
and b < c

these 3 eqns can be fit only in one way
a...x...b...c...y...d
=> x < y

Thus this is sufficient.

Hence B
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Math Expert V
Joined: 02 Sep 2009
Posts: 58320
Re: If a < x < b and c < y < d, is x < y ?  [#permalink]

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SOLUTION

If a < x < b and c < y < d, is x < y ?

(1) a < c. From this statement we cannot determine whether $$x < y$$. For example, consider that $$a$$ and $$c$$ are some negative numbers and $$x$$ and $$y$$ are some positive numbers, we can have that $$x<y$$ as well as $$y<x$$. Not sufficient.

(2) b < c. Since, $$b<c$$, then $$a < x < b<c < y < d$$ --> $$x<y$$. Sufficient.

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Joined: 01 Sep 2010
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Re: If a < x < b and c < y < d, is x < y ?  [#permalink]

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This one is tricky because we could assume right away that we need both stats ar at least 3 elements to have an answer

1) a < c we do not know nothing about B (in this case we can see B as a pivotal element)

2) b < c thi is suff because in the chain a < b AND b < c the c < d........

B is the answer
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Re: If a < x < b and c < y < d, is x < y ?  [#permalink]

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from stat 1 -
a < c
assigning a, b, c , d few numbers would give us easy approach
a=2 , b = 4 , c= 3 (a<c) , d = 5
now 2<x<4 and 3<y<5
for x = 3.9 and y = 3.1
Stat 1 insufficient

from this we can say if c would be greater than b then x would be definitely less then y
say b = 4 and c = 5 .
stat 2 is sufficient alone.
correct - B
Target Test Prep Representative G
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Re: If a < x < b and c < y < d, is x < y ?  [#permalink]

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1
Bunuel wrote:
The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

If a < x < b and c < y < d, is x < y ?

(1) a < c
(2) b < c

Solution:

We are given that a < x < b, and that c < y < d. We must determine whether x < y.

Statement One Alone:

a < c

From the information in statement one we know that a (the smallest value in the inequality a < x < b) is less than c (the smallest value in the inequality c < y < d). However, that information still does not allow us to determine whether x is less than y.

For example, let a = 1, c = 2, x = 2, and y = 3. In this scenario x is less than y.

However, if a = 1, c = 2, x = 4, and y = 3, then x is greater than y.

Statement one is not sufficient to answer the question. We can eliminate answer choices A and D.

Statement Two Alone:

b < c

Using the information in statement two we know that b (the largest value in the inequality a < x < b) is less than c (the smallest value in the inequality c < y < d). Thus we know that x must be less than y. To support this conclusion we can use a few convenient numbers.

Let’s say b = 5 and c = 6. Thus we can say:

a < x < 5 and 6 < y < d

We see that x must be less than 5 and y must be greater than 6. Once again, this tells us that x must be less than y. Statement two is sufficient to answer the question.

The answer is B.
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Intern  Joined: 01 May 2015
Posts: 37
Re: If a < x < b and c < y < d, is x < y ?  [#permalink]

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(1) is insufficient obviously.

(2) says b < c. So then, if we combine both inequalities given in the question, we have: a < x < b < c < y < d.
So, we know that x < y. So, sufficient.

Hence B.
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Posts: 13147
Re: If a < x < b and c < y < d, is x < y ?  [#permalink]

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_________________ Re: If a < x < b and c < y < d, is x < y ?   [#permalink] 19 Dec 2018, 13:32
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