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Old 2008 September 5th, 11:33 AM   #1 (permalink)
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GMAT Prep questions

(1) If some goes from house to work 22 miles an hour in 9 minutes. How long would it take to cover the same distance in 6 minutes?

(2)In a survey, each student selected from a list of 12 songs the 2 songs that the student liked best. If each song was selected 4 times, how many were surveyed?

(3)Quality control is made by inspecting a sample of 2 lightbulbs from a box of 12?
(6)
(24)
(36)
(66)
(72)
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Old 2008 September 5th, 12:19 PM   #2 (permalink)
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1.) V=D/T, D=VT
D=22*9/60 = x*6/60

x = 22*9/6=33mph

2.) 48 total selections, each student allowed 2. 24 students surveyed

3.) What?
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Old 2008 September 13th, 04:59 PM   #3 (permalink)
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1 answer 33mph
2-total combinations =12*4 =48, now each pair say ab and ba is same and counted twice so 48/2=24
3-66=12c2
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Old 2008 September 13th, 06:14 PM   #4 (permalink)
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Quote:
How long would it take to cover the same distance in 6 minutes?
why 6 minutes of course!
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Old 2008 September 17th, 10:04 AM   #5 (permalink)
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Quote:
Originally Posted by sudi760mba View Post
(1) If some goes from house to work 22 miles an hour in 9 minutes. How long would it take to cover the same distance in 6 minutes?

(2)In a survey, each student selected from a list of 12 songs the 2 songs that the student liked best. If each song was selected 4 times, how many were surveyed?

(3)Quality control is made by inspecting a sample of 2 lightbulbs from a box of 12?
(6)
(24)
(36)
(66)
(72)
Thanks for the responses. I understand how to calculate (1) and (3) but I'm still confused on (2).

Is (2) using combinations or permutations? If so, how do break it down step by step?

Thanks!
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Old 2008 September 26th, 04:11 AM   #6 (permalink)
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PLEASE somebody provide the explanation for (2) a little more clearly
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