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If the two floors in a certain building are 9 feet apart

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If the two floors in a certain building are 9 feet apart [#permalink] New post 23 Jul 2012, 04:48
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The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

If the two floors in a certain building are 9 feet apart, how many steps are there in a set of stairs that extends from the first floor to the second floor of the building?

(1) Each step is 3/4 foot high.
(2) Each step is 1 foot wide.

Practice Questions
Question: 4
Page: 275
Difficulty: 550


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Re: If the two floors in a certain building are 9 feet apart [#permalink] New post 27 Jul 2012, 08:00
SOLUTION

If the two floors in a certain building are 9 feet apart, how many steps are there in a set of stairs that extends from the first floor to the second floor of the building?

(1) Each step is 3/4 foot high. Since each step is 3/4 foot high and the stairs rises 9 feet from the first floor to the second, the number of steps must be \frac{9}{(\frac{3}{4})}=12. Sufficient.

(2) Each step is 1 foot wide. Clearly insufficient.

Answer: A.
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RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory

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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. NEW!!!

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. NEW!!!


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Re: If the two floors in a certain building are 9 feet apart   [#permalink] 27 Jul 2012, 08:00
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