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In the figure shown above, x is the length of side BD of triangle ABD.

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In the figure shown above, x is the length of side BD of triangle ABD.  [#permalink]

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New post 25 Feb 2016, 05:05
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In the figure shown above, x is the length of side BD of triangle ABD. If D is a point that lies on line AC and x is an integer, what is the value of x?
A 2
B 3
C 4
D Either 3 or 4
E Cannot be determined

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Re: In the figure shown above, x is the length of side BD of triangle ABD.  [#permalink]

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New post 25 Feb 2016, 05:16
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Gnpth wrote:
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In the figure shown above, x is the length of side BD of triangle ABD. If D is a point that lies on line AC and x is an integer, what is the value of x?
A 2
B 3
C 4
D Either 3 or 4
E Cannot be determined

Attachment:
Problem.PNG


The length of any side of a triangle must be larger than the positive difference of the other two sides, but smaller than the sum of the other two sides.

For triangle ABD: (2 - 2) < x < (2 + 2) --> 0 < x < 4;
For triangle BCD: (4 - 2) < x < (4 + 2) --> 2 < x < 6.

From above: 2 < x < 4. Since x is an integer then x = 3.

Answer: B.
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Re: In the figure shown above, x is the length of side BD of triangle ABD.  [#permalink]

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New post 24 Mar 2016, 00:00
Seems so straightfwd after reading the reply!
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Re: In the figure shown above, x is the length of side BD of triangle ABD.  [#permalink]

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Re: In the figure shown above, x is the length of side BD of triangle ABD.  [#permalink]

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New post 05 Apr 2016, 09:51
First, we know that the length can be determined, since with the measures given, the triangles are well defined. We have an isosceles triangle with two sides of length 4 and one side of length 2. The line BD bisecting AC can only have one possible length. So answers D and E are out.

Now, line BD can't have a length of 4, since it would have to be on top of BC for that to be true. Answer C is out.

If BD had a length of 2, then triangle ABD would be an equilateral triangle, with each interior angle = 60. But we know that angle BAD > 60 since triangle ABC is isosceles, and AB is the short side. Answer A is out.

Answer must be B.
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In the figure shown above, x is the length of side BD of triangle ABD  [#permalink]

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New post 11 Nov 2016, 05:39
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In the figure shown above, \(x\) is the length of side \(BD\) of triangle \(ABD\). If \(D\) is a point that lies on line \(AC\) and \(x\) is an integer, what is the value of \(x\)?

    A. \(2\)
    B. \(3\)
    C. \(4\)
    D. Both \(3\) and \(4\) are possible values for \(x\)
    E. Cannot be determined

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Re: In the figure shown above, x is the length of side BD of triangle ABD  [#permalink]

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New post 11 Nov 2016, 10:46
EgmatQuantExpert wrote:
Image

In the figure shown above, \(x\) is the length of side \(BD\) of triangle \(ABD\). If \(D\) is a point that lies on line \(AC\) and \(x\) is an integer, what is the value of \(x\)?

    A. \(2\)
    B. \(3\)
    C. \(4\)
    D. Both \(3\) and \(4\) are possible values for \(x\)
    E. Cannot be determined

Take a stab at this fresh question from e-GMAT. Post your analysis below.

Official Solution to be provided after receiving some good analyses. :)


AB=2 and BC=4

So 2<=x<4

So x can be 2 or 3.

Now consider triangle BCD.

4-2<x<4+2

2<x<6


From above statements, definitely x has to be 3.

IMO B


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Re: In the figure shown above, x is the length of side BD of triangle ABD  [#permalink]

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New post 11 Nov 2016, 16:35
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EgmatQuantExpert wrote:
Image

In the figure shown above, \(x\) is the length of side \(BD\) of triangle \(ABD\). If \(D\) is a point that lies on line \(AC\) and \(x\) is an integer, what is the value of \(x\)?

    A. \(2\)
    B. \(3\)
    C. \(4\)
    D. Both \(3\) and \(4\) are possible values for \(x\)
    E. Cannot be determined


IMPORTANT RULE: If two sides of a triangle have lengths A and B, then . . .
difference between sides A and B < third side < sum of sides A and B

Consider ∆ABC
The two known sides have lengths 2 and 2
So, applying the above rule, 2 - 2 < x < 2 + 2
In other words, 0 < x < 4
IMPORTANT: We're told that x is an integer.
So the possible values of x are 1, 2 and 3

Now consider ∆BDC
The two known sides have lengths 4 and 2
So, applying the above rule, 4 - 2 < x < 4 + 2
In other words, 2 < x < 6
Since x is an integer, the possible values of x are 3, 4, and 5

So, x must be 1, 2 or 3 AND x must be 3, 4 or 5
Since x = 3 is the only value that satisfies both conditions, x must equal 3

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In the figure shown above, x is the length of side BD of triangle ABD.  [#permalink]

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New post 11 Nov 2016, 20:13
EgmatQuantExpert wrote:
Image

In the figure shown above, \(x\) is the length of side \(BD\) of triangle \(ABD\). If \(D\) is a point that lies on line \(AC\) and \(x\) is an integer, what is the value of \(x\)?

    A. \(2\)
    B. \(3\)
    C. \(4\)
    D. Both \(3\) and \(4\) are possible values for \(x\)
    E. Cannot be determined

Take a stab at this fresh question from e-GMAT. Post your analysis below.

Official Solution to be provided after receiving some good analyses. :)


My analysis
1) there can only be one value of x, be it integer or noninteger ..
2) the value of x should be \(\sqrt{6}\)..
3) would look forward for your solution that makes 3 as answer..

Chetan...

acegmat123 now on why answer shud be \(\sqrt{6}\)

Drop a perpendicular from B to AD, say at E..
From ∆ABE and ∆BCE, you can find AE by equating BE in both..
AE is 0.5..
Take ∆ABE, AB is 2, AE is 0.5,so BE will be \(\sqrt{3.75}\)...
Now in ∆BDE, BE is \(\sqrt{3.75}\), DE is 1.5, so BD or x = \(\sqrt{3.75+1.5^2}\)=\(\sqrt{6}\)..
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Re: In the figure shown above, x is the length of side BD of triangle ABD  [#permalink]

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New post 11 Nov 2016, 20:38
chetan2u wrote:
EgmatQuantExpert wrote:
Image

In the figure shown above, \(x\) is the length of side \(BD\) of triangle \(ABD\). If \(D\) is a point that lies on line \(AC\) and \(x\) is an integer, what is the value of \(x\)?

    A. \(2\)
    B. \(3\)
    C. \(4\)
    D. Both \(3\) and \(4\) are possible values for \(x\)
    E. Cannot be determined

Take a stab at this fresh question from e-GMAT. Post your analysis below.

Official Solution to be provided after receiving some good analyses. :)


My analysis
1) there can only be one value of x, be it integer or noninteger ..
2) the value of x should be \(\sqrt{6}\)..
3) would look forward for your solution that makes 3 as answer..

Chetan...



Can you please explain how you got x=\(\sqrt{6}\).

Thanks in advance!!

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Re: In the figure shown above, x is the length of side BD of triangle ABD.  [#permalink]

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Re: In the figure shown above, x is the length of side BD of triangle ABD.   [#permalink] 02 Apr 2018, 08:10
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