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# If = 7/x + 2/y = 7 and xy = 4, then 7y + 2x =? A. 28 B. 14 C. 7/4 D. 4

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Re: If = 7/x + 2/y = 7 and xy = 4, then 7y + 2x =? A. 28 B. 14 C. 7/4 D. 4 [#permalink]
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Archit3110 wrote:
If $$= \frac{7}{x} + \frac{2}{y} = 7$$ and $$xy = 4$$, then $$7y + 2x =?$$

A. 28

B. 14

C. $$\frac{7}{4}$$

D. $$\frac{4}{7}$$

E. $$\frac{2}{7}$$

Source: McGraw-Hill's GMAT

SajjadAhmad i think this question should be tagged sub 600 level
solve the eqn
m]= \frac{7}{x} + \frac{2}{y} = 7[/m]
7y+2x=7xy
xy=4 given
so 7x+2y= 28
IMO A
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Re: If = 7/x + 2/y = 7 and xy = 4, then 7y + 2x =? A. 28 B. 14 C. 7/4 D. 4 [#permalink]
Don't worry dear, after approx 30 timers attempts GMAT Club timer's system automatically manage its difficulty level.

Thanks

Archit3110 wrote:
If $$= \frac{7}{x} + \frac{2}{y} = 7$$ and $$xy = 4$$, then $$7y + 2x =?$$

A. 28

B. 14

C. $$\frac{7}{4}$$

D. $$\frac{4}{7}$$

E. $$\frac{2}{7}$$

Source: McGraw-Hill's GMAT

SajjadAhmad i think this question should be tagged sub 600 level
solve the eqn
m]= \frac{7}{x} + \frac{2}{y} = 7[/m]
7y+2x=7xy
xy=4 given
so 7x+2y= 28
IMO A

ohh well thats a fun fact I wasnt aware of this... thanks for sharing..
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Re: If = 7/x + 2/y = 7 and xy = 4, then 7y + 2x =? A. 28 B. 14 C. 7/4 D. 4 [#permalink]
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Re: If = 7/x + 2/y = 7 and xy = 4, then 7y + 2x =? A. 28 B. 14 C. 7/4 D. 4 [#permalink]
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