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

Expert's post

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Difficulty:

5% (low)

Question Stats:

84% (01:33) correct
16% (00:44) wrong based on 299 sessions

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

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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