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by ketkoag » Sat May 30, 2009 4:13 am
Some people are waiting for a service. 12% of them have waited for more than 5 minutes and 4% of them have waited for more than 10 minutes. How many people have waited more than 5 minutes and less than 10 minutes?
1) 88 people have waited for less than 5 minutes
2) 4 people have waited for more than 10 minutes

i got the right answer, please lemme know whether the value below is correct.
my answer: 8(people waited more than 5 minutes and less than 10 minutes)
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by raleigh » Sat May 30, 2009 9:05 am
# of people that have waited more than 5 minutes - # of people that have waited more than 10 minutes = # of people that have waited between 5 and 10 minutes.

(a) Label the next two equations for easy reference.
.12*total = # of people that have waited more than 5 minutes
.04*total = # of people that have waited more than 10 minutes.

(1) total = # of people that have waited for less than 5 minutes + # of people that have waited for more than 5 minutes.

total = 88 + .12total
.88 total = 88
total = 100

Since we now know the total, we can get numbers for both parts of (a), and answer the question. This statement is sufficient.

(2).04 total = 4
total = 100.

Again, you can get numbers for both parts of (a) and answer the question. This statement is sufficient.

The answer is D. Note that the answer to the question is 8, but you don't need to work it out.
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