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

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Math Expert
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If the two floors in a certain building are 9 feet apart [#permalink]  23 Jul 2012, 03:48
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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
[Reveal] Spoiler: OA

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Re: If the two floors in a certain building are 9 feet apart [#permalink]  27 Jul 2012, 07:00
Expert's post
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.

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Re: If the two floors in a certain building are 9 feet apart [#permalink]  25 Apr 2015, 01:26
Bunuel wrote:
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

Hi Bunuel

In this why cant answer be E. What if I assume stairs are made in circular pattern and not vertical as assumed in the solution.
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Re: If the two floors in a certain building are 9 feet apart [#permalink]  25 Apr 2015, 02:32
sinhap07 wrote:
Bunuel wrote:
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

Hi Bunuel

In this why cant answer be E. What if I assume stairs are made in circular pattern and not vertical as assumed in the solution.

Hello sinhap07
Even if stairs in circular pattern they are still should going to the next floor. Right?
Re: If the two floors in a certain building are 9 feet apart   [#permalink] 25 Apr 2015, 02:32
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