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Two numbers have a sum of 10 and a product of 20. What is

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Manager
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Joined: 28 Feb 2003
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Two numbers have a sum of 10 and a product of 20. What is [#permalink]

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New post 19 May 2003, 03:57
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A
B
C
D
E

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25% (00:00) correct 75% (00:09) wrong based on 4 sessions

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Two numbers have a sum of 10 and a product of 20. What is the sum of the reciprocals of the two numbers?

A) 1/4
B) 2
C) 1/8
D) 1/2
E) 1/10
Manager
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Joined: 22 Apr 2003
Posts: 177
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Re: GMAT-PS: sum and product [#permalink]

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New post 19 May 2003, 04:21
brstorewala wrote:
Two numbers have a sum of 10 and a product of 20. What is the sum of the reciprocals of the two numbers?

A) 1/4
B) 2
C) 1/8
D) 1/2
E) 1/10


Answer is D

Sol:X+Y=10 X*Y=20

1/X+1/Y=?

Y+X/XY=10/20=1/2
Director
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Re: GMAT-PS: sum and product [#permalink]

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New post 15 Apr 2011, 14:47
10/20 =1/2

Answer is D.

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Manager
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Re: GMAT-PS: sum and product [#permalink]

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New post 15 Apr 2011, 20:40
I got into substituting values into -b+/- root b^2 - 4ac/2a and ended up spending 4 mins to solve this question, should remember the rule, every GMAT math question can be solved in less than 2 mins. Good job chihao!
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Re: GMAT-PS: sum and product   [#permalink] 15 Apr 2011, 20:40
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Two numbers have a sum of 10 and a product of 20. What is

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