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Senior Manager  D
Joined: 29 Oct 2019
Posts: 373
If 20rxy + 20sxy = 100 and r + s = 5, what is the value of xy? (A) 0 (  [#permalink]

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Difficulty:   5% (low)

Question Stats: 94% (00:55) correct 6% (01:36) wrong based on 49 sessions

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If 20rxy + 20sxy = 100 and r + s = 5, what is the value of xy?

(A) 0

(B) 1

(C) 2

(D) 3

(E) 4
Manager  S
Joined: 10 Jun 2018
Posts: 59
Re: If 20rxy + 20sxy = 100 and r + s = 5, what is the value of xy? (A) 0 (  [#permalink]

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2
sjuniv32 wrote:
If 20rxy + 20sxy = 100 and r + s = 5, what is the value of xy?

(A) 0

(B) 1

(C) 2

(D) 3

(E) 4

20rxy+20sxy=100
20xy(r+s)=100
(20)xy(5)=100
xy=1
Intern  B
Joined: 14 Oct 2017
Posts: 38
Concentration: Finance, Real Estate
GPA: 3.2
Re: If 20rxy + 20sxy = 100 and r + s = 5, what is the value of xy? (A) 0 (  [#permalink]

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you can simplify by taking 20 xy common from the LHS which gives you 20xy( r+ s) = 100
dividing 20 on both sides xy ( r+s) = 5
r+s + 5 is given in the question stem and replacing it gives you xy(1)=5
which gives xy = 1
e-GMAT Representative V
Joined: 04 Jan 2015
Posts: 3410
Re: If 20rxy + 20sxy = 100 and r + s = 5, what is the value of xy? (A) 0 (  [#permalink]

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Solution

Given
In this question, we are given that
• 20rxy + 20sxy = 100 and r + s = 5

To find
We need to determine
• The value of xy

Approach and Working out
From the equation 20rxy + 20sxy = 100, we can simplify and write
• 20rxy + 20sxy = 100
Or, 20xy (r + s) = 100
Or, 20xy * 5 = 100
Or, 100xy = 100
Or, xy = 100/100 = 1

Thus, option B is the correct answer.

_________________
CEO  V
Joined: 03 Jun 2019
Posts: 3182
Location: India
GMAT 1: 690 Q50 V34 WE: Engineering (Transportation)
Re: If 20rxy + 20sxy = 100 and r + s = 5, what is the value of xy? (A) 0 (  [#permalink]

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sjuniv32 wrote:
If 20rxy + 20sxy = 100 and r + s = 5, what is the value of xy?

(A) 0

(B) 1

(C) 2

(D) 3

(E) 4

Asked: If 20rxy + 20sxy = 100 and r + s = 5, what is the value of xy?

20rxy + 20sxy = 100
r + s = 5

20xy(r+s) = 100
20xy*5 = 100
xy = 1

IMO B
_________________
Kinshook Chaturvedi
Email: kinshook.chaturvedi@gmail.com
Intern  B
Joined: 14 Apr 2020
Posts: 26
Location: India
Re: If 20rxy + 20sxy = 100 and r + s = 5, what is the value of xy? (A) 0 (  [#permalink]

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sjuniv32 wrote:
If 20rxy + 20sxy = 100 and r + s = 5, what is the value of xy?

(A) 0

(B) 1

(C) 2

(D) 3

(E) 4

20xy(r+s)=100
r+s= 5 (given)
20*5*xy= 100
100xy= 100
=>xy=1

Posted from my mobile device
_________________
Manisha Shrivastava
GMAT-GRE Quant Expert
PrepMinds-Founderhttp://www.theprepminds.com
Manager  B
Joined: 11 Oct 2019
Posts: 103
Re: If 20rxy + 20sxy = 100 and r + s = 5, what is the value of xy? (A) 0 (  [#permalink]

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$$20rxy + 20sxy = 100$$
$$20xy(r+s)=100$$
$$20xy*5=100$$
$$100xy=100$$
$$xy=1$$ Re: If 20rxy + 20sxy = 100 and r + s = 5, what is the value of xy? (A) 0 (   [#permalink] 06 Jul 2020, 12:26

# If 20rxy + 20sxy = 100 and r + s = 5, what is the value of xy? (A) 0 (   