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# If x = 3 and y = 4, then xy/(1/x + 1/y) =

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Math Expert
Joined: 02 Sep 2009
Posts: 44598
If x = 3 and y = 4, then xy/(1/x + 1/y) = [#permalink]

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15 Mar 2018, 00:09
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Difficulty:

15% (low)

Question Stats:

100% (00:26) correct 0% (00:00) wrong based on 41 sessions

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If x = 3 and y = 4, then $$\frac{xy}{\frac{1}{x}+ \frac{1}{y}} =$$

A. 7/12

B. 12/7

C. 12

D. 144/7

E. 84
[Reveal] Spoiler: OA

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Intern
Joined: 03 Nov 2014
Posts: 9
Re: If x = 3 and y = 4, then xy/(1/x + 1/y) = [#permalink]

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15 Mar 2018, 00:17

4*3/1/3+1/4

12/7/12

12*12/7

Target Test Prep Representative
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 2447
Location: United States (CA)
Re: If x = 3 and y = 4, then xy/(1/x + 1/y) = [#permalink]

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19 Mar 2018, 06:43
Bunuel wrote:
If x = 3 and y = 4, then $$\frac{xy}{\frac{1}{x}+ \frac{1}{y}} =$$

A. 7/12

B. 12/7

C. 12

D. 144/7

E. 84

Multiplying the expression by xy/xy, we have:

(x^2)(y^2)/(y + x) = (3^2)(4^2)/(7) = 144/7

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Re: If x = 3 and y = 4, then xy/(1/x + 1/y) =   [#permalink] 19 Mar 2018, 06:43
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