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If 1.5/(0.2+x)=5, then x=

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If 1.5/(0.2+x)=5, then x= [#permalink] New post 18 Sep 2012, 01:48
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A
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Difficulty:

  5% (low)

Question Stats:

85% (01:33) correct 15% (00:25) wrong based on 209 sessions
The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

If \frac{1.5}{0.2+x}=5, then x=

(A) -3.7
(B) 0.1
(C) 0.3
(D) 0.5
(E) 2.8

Practice Questions
Question: 42
Page: 157
Difficulty: 550


GMAT Club is introducing a new project: The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

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[Reveal] Spoiler: OA

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Re: If 1.5/(0.2+x)=5, then x= [#permalink] New post 18 Sep 2012, 01:48
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Re: If 1.5/(0.2+x)=5, then x= [#permalink] New post 18 Sep 2012, 02:21
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solving for x we get x = 0.1
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Re: If 1.5/(0.2+x)=5, then x= [#permalink] New post 18 Sep 2012, 03:58
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Bunuel wrote:
The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

If \frac{1.5}{0.2+x}=5, then x=

(A) -3.7
(B) 0.1
(C) 0.3
(D) 0.5
(E) 2.8

Practice Questions
Question: 42
Page: 157
Difficulty: 550


GMAT Club is introducing a new project: The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

Each week we'll be posting several questions from The Official Guide for GMAT® Review, 13th Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

We'll be glad if you participate in development of this project:
1. Please provide your solutions to the questions;
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

Thank you!

Solving the equation we get,
.3 = .2 + x
x = .1

Answer B
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Re: If 1.5/(0.2+x)=5, then x= [#permalink] New post 18 Sep 2012, 04:05
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Bunuel wrote:
The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

If \frac{1.5}{0.2+x}=5, then x=

(A) -3.7
(B) 0.1
(C) 0.3
(D) 0.5
(E) 2.8

Practice Questions
Question: 42
Page: 157
Difficulty: 550


GMAT Club is introducing a new project: The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

Each week we'll be posting several questions from The Official Guide for GMAT® Review, 13th Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

We'll be glad if you participate in development of this project:
1. Please provide your solutions to the questions;
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

Thank you!


When we divide a number D, the dividend, by another number d, the divisor, we obtain the quotient Q. Obviously, the dividend is the product of the quotient and the divisor: D=dQ.

In our case, 1.5=5(0.2+x) or 1.5=1+5x, from which 5x=0.5, and finally, x=0.5/5=0.1.

Answer B.
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Re: If 1.5/(0.2+x)=5, then x= [#permalink] New post 18 Sep 2012, 05:21
1
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Bunuel wrote:
If \frac{1.5}{0.2+x}=5, then x=

(A) -3.7
(B) 0.1
(C) 0.3
(D) 0.5
(E) 2.8



Cross-multiplying both sides:
1.5 = 5(.2 + x)
=> 1.5 = 1 + 5x
=> 0.5 = 5x
=> x = .5/5
=> x = 0.1

B
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Re: If 1.5/(0.2+x)=5, then x= [#permalink] New post 21 Sep 2012, 02:05
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SOLUTION

If \frac{1.5}{0.2+x}=5, then x=

(A) -3.7
(B) 0.1
(C) 0.3
(D) 0.5
(E) 2.8

The denominator must be equal to 0.3 in order the equation to hold true, thus 0.2+x=0.3 --> x=0.1.

Answer: B.

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NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: If 1.5/(0.2+x)=5, then x= [#permalink] New post 10 Dec 2012, 03:09
\frac{1.5}{0.2+x}=5
1.5=5(0.2+x)
1.5=1 + 5x
1.5-1=5x
0.5=5x
x=0.1

Answer: B
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Re: If 1.5/(0.2+x)=5, then x=   [#permalink] 10 Dec 2012, 03:09
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