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How many newspapers were sold at a certain newsstand today?

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How many newspapers were sold at a certain newsstand today? [#permalink] New post 09 Jan 2014, 05:49
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The Official Guide For GMAT® Quantitative Review, 2ND Edition

How many newspapers were sold at a certain newsstand today?

(1) A total of 100 newspapers were sold at the newsstand yesterday, 10 fewer than twice the number sold today.
(2) The number of newspapers sold at the newsstand yesterday was 45 more than the number sold today.

Data Sufficiency
Question: 26
Category: Algebra First- and second-degree equations
Page: 155
Difficulty: 600


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Re: How many newspapers were sold at a certain newsstand today? [#permalink] New post 09 Jan 2014, 05:49
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SOLUTION

How many newspapers were sold at a certain newsstand today?

Say x is the number of newspapers sold today.

(1) A total of 100 newspapers were sold at the newsstand yesterday, 10 fewer than twice the number sold today --> 100 = 2x - 10. We can solve for x. Sufficient.

(2) The number of newspapers sold at the newsstand yesterday was 45 more than the number sold today. Clearly insufficient.

Answer: A.
_________________

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: How many newspapers were sold at a certain newsstand today? [#permalink] New post 09 Jan 2014, 22:02
Let the no. of newspapers sold today be t and yesterday be y.
Question: t=?

(1). y = 100;
Also, y = 2t-10;
=> 100 = 2t-10;
2t = 110; t = 55;

Sufficient.

(2). y = t + 45; Insufficient because of 2 variables in the statement.

Therefore, (A) is the answer.
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Re: How many newspapers were sold at a certain newsstand today? [#permalink] New post 10 Jan 2014, 10:27
Bunuel wrote:
The Official Guide For GMAT® Quantitative Review, 2ND Edition

How many newspapers were sold at a certain newsstand today?

(1) A total of 100 newspapers were sold at the newsstand yesterday, 10 fewer than twice the number sold today.
(2) The number of newspapers sold at the newsstand yesterday was 45 more than the number sold today.



Statement 1) 100 = 2todays -10 => Todays we can determine. Sufficient.
Statement 2) We need to have the value of newspaper sold yesterday to determine today's. Not Sufficient.

Hence Option A)
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Re: How many newspapers were sold at a certain newsstand today? [#permalink] New post 11 Jan 2014, 06:31
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SOLUTION

How many newspapers were sold at a certain newsstand today?

Say x is the number of newspapers sold today.

(1) A total of 100 newspapers were sold at the newsstand yesterday, 10 fewer than twice the number sold today --> 100 = 2x - 10. We can solve for x. Sufficient.

(2) The number of newspapers sold at the newsstand yesterday was 45 more than the number sold today. Clearly insufficient.

Answer: A.
_________________

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.


What are GMAT Club Tests?
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Re: How many newspapers were sold at a certain newsstand today?   [#permalink] 11 Jan 2014, 06:31
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