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# What is the value of x

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Founder
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What is the value of x [#permalink]  15 May 2018, 09:34
Expert's post
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Question Stats:

93% (01:23) correct 6% (01:25) wrong based on 15 sessions
Attachment:

#GREpracticequestion What is the value of x in the figure above.jpg [ 11.68 KiB | Viewed 602 times ]

What is the value of x in the figure above?

A. 12

B. 12.5

C. 15

D. $$9 \sqrt{3}$$

E. 18
[Reveal] Spoiler: OA

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Active Member
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Re: What is the value of x [#permalink]  17 May 2018, 00:12
1
KUDOS
The figure has two right-angle symbol drawn on to it.
we can find the solution to the problem by focusing on only the big triangle as such we have three sides; 20,25 and x

Use the Pythagoras theorem to find the value of x:

$$x^2 + 20^2 = 25^2$$

solve for x; x = 15
option C
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Re: What is the value of x [#permalink]  21 Jan 2019, 08:23
25^2 - 20 ^2 = 15^2
Ans 15
Re: What is the value of x   [#permalink] 21 Jan 2019, 08:23
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