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23 Jul 2012, 04:48
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A
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Difficulty:
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86% (00:46) correct
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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.
(1) Each step is 3/4 foot high.
(2) Each step is 1 foot wide.
27 Jul 2012, 08:00
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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.
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.
General Discussion
