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GRE Math Challenge #22- Solve 5x +13 = 31

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GRE Math Challenge #22- Solve 5x +13 = 31 [#permalink]  07 Sep 2014, 06:37
Expert's post
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Question Stats:

79% (00:44) correct 20% (00:35) wrong based on 29 sessions
If 5x +13 = 31, what is the value of $$\sqrt{5x + 31}$$ ?

A. $$\sqrt{13}$$

B. $$\sqrt{\frac{173}{5}}$$

C. $$7$$

D. $$13$$

E. $$169$$
[Reveal] Spoiler: OA

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Sandy
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Re: GRE Math Challenge #22- Solve 5x +13 = 31 [#permalink]  16 Jan 2018, 02:23
x= 18/5
input 18/5 , get sqrt 49,ans is 7
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Re: GRE Math Challenge #22- Solve 5x +13 = 31 [#permalink]  19 Jan 2018, 12:56
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Expert's post
sandy wrote:
If 5x + 13 = 31, what is the value of $$\sqrt{5x + 31}$$ ?

A. $$\sqrt{13}$$

B. $$\sqrt{\frac{173}{5}}$$

C. $$7$$

D. $$13$$

E. $$169$$

Given: 5x + 13 = 31
Add 18 to both sides to get: 5x + 31 = 49

We want to determine the value of $$\sqrt{5x + 31}$$

√(5x + 31) = √(49)
= 7

Cheers,
Brent
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Brent Hanneson – Creator of greenlighttestprep.com

Re: GRE Math Challenge #22- Solve 5x +13 = 31   [#permalink] 19 Jan 2018, 12:56
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