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guerrero25
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Between 7 A.M. and 9 A.M., on average 50 percent of the park Updated on: 27 Apr 2019, 20:46
Originally posted by guerrero25 on 18 Aug 2013, 07:41.
Last edited by gmat1393 on 27 Apr 2019, 20:46, edited 2 times in total.
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

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45% (medium)

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67% (01:57) correct 33% (02:01) wrong based on 712 sessions

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Between 7 A.M. and 9 A.M., on average 50 percent of the parking spaces at a parking lot near Stoneville International Airport were occupied. During these two hours approximately 8 cars were parked in the parking lot every 5 minutes. Between 9 A.M. and 11 A.M. of the same day, on average 70 percent of the parking spaces of the same parking lot were occupied, even though only 6 cars were parked every 5 minutes.

Which of the following, if true, helps to resolve the apparent discrepancy above?

(A)Fewer cars have left the parking lot between 9 A.M. and 11 A.M. than between 7A.M. and 9 A.M.

(B)Between 9 A.M. and 11 A.M., a parking lot at a mall situated near the airport, was filled, and some people who came to the mall had to park their cars at the parking lot near the Stoneville International Airport.

(C)Fewer planes departed from Stoneville International Airport between 9 A.M. and 11 A.M. than between 7 A.M. and 9 A.M.

(D)The number of large cars parked at the parking lot near Stoneville International Airport between 9 A.M. and 11 A.M. was greater than between 7 A.M. and 9 A.M.

(E)Some of the cars that were parked before 7 A.M. left the parking lot only after 11 A.M.
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Between 7 A.M. and 9 A.M., on average 50 percent of the park 18 Aug 2013, 08:27
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guerrero25
Between 7 A.M. and 9 A.M., on average 50 percent of the parking spaces at a parking lot near Stoneville International Airport were occupied. During these two hours approximately 8 cars were parked in the parking lot every 5 minutes. Between 9 A.M. and 11 A.M. of the same day, on average 70 percent of the parking spaces of the same parking lot were occupied, even though only 6 cars were parked every 5 minutes.

Which of the following, if true, helps to resolve the apparent discrepancy above?
(A)Fewer cars have left the parking lot between 9 A.M. and 11 A.M. than between 7A.M. and 9 A.M.
(B)Between 9 A.M. and 11 A.M., a parking lot at a mall situated near the airport, was filled, and some people who came to the mall had to park their cars at the parking lot near the Stoneville International Airport.
(C)Fewer planes departed from Stoneville International Airport between 9 A.M. and 11 A.M. than between 7 A.M. and 9 A.M.
(D)The number of large cars parked at the parking lot near Stoneville International Airport between 9 A.M. and 11 A.M. was greater than between 7 A.M. and 9 A.M.
(E)Some of the cars that were parked before 7 A.M. left the parking lot only after 11 A.M.


OA to follow ..
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IMO A

Let say parking lot has \(20\) space for parking

between 7 - 9
average occupancy = 50% = 10 places are full
every 5 mins 8 cars were parked....so in order to make up to 50% 8 cars have to leave parking space.
so it means every 5 mins ==>8 cars are leaving==>so between 7 - 9 (120 mins) ==.total cars left = \(8 * \frac{120}{5} =192\)

between 9 - 11
average occupancy = 70% = 14 places are full
every 5 mins 6 cars were parked....so in order to make up to 70% 6 cars have to leave parking space.
so it means every 5 mins ==>6 cars are leaving==>so between 7 - 9(120 mins) ==.total cars left =\(6 * \frac{120}{5} =144\)

clearly,Fewer cars have left the parking lot between 9 A.M. and 11 A.M. than between 7A.M. and 9 A.M.
hence A

LETS SEE OTHER OPTIONS:

(A)Fewer cars have left the parking lot between 9 A.M. and 11 A.M. than between 7A.M. and 9 A.M.
CORRECT

(B)Between 9 A.M. and 11 A.M., a parking lot at a mall situated near the airport, was filled, and some people who came to the mall had to park their cars at the parking lot near the Stoneville International Airport.
WRONG
==STILL THE PARADOX IS NOT CLEAR WHY EVERY 5 MINUTES FEWER CARS WERE PARKED.

(C)Fewer planes departed from Stoneville International Airport between 9 A.M. and 11 A.M. than between 7 A.M. and 9 A.M.
WRONG
==OUT OF SCOPE.

(D)The number of large cars parked at the parking lot near Stoneville International Airport between 9 A.M. and 11 A.M. was greater than between 7 A.M. and 9 A.M.
WRONG
==NOW DONT THINK THAT LARGE CARS ARE GOING TO OCCUPY MORE THAN 1 SPACE OF PARKING LOT FOR EACH BIG CAR.

(E)Some of the cars that were parked before 7 A.M. left the parking lot only after 11 A.M.
WRONG
==THIS WILL BE SAME FOR BOTH TIMING SO NOT RESOLVING THE PARADOX.

HENCE A
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Between 7 A.M. and 9 A.M., on average 50 percent of the park 11 Apr 2018, 20:35
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Why D would not be the answer ? Here in the CR author has not mentioned the number of cars in a lot and has not mentioned whether the spaces required for large and small cars are similar. Hence, large cars must occupy more space than small cars.
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Between 7 A.M. and 9 A.M., on average 50 percent of the park 21 Apr 2018, 11:31
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guerrero25
Between 7 A.M. and 9 A.M., on average 50 percent of the parking spaces at a parking lot near Stoneville International Airport were occupied. During these two hours approximately 8 cars were parked in the parking lot every 5 minutes. Between 9 A.M. and 11 A.M. of the same day, on average 70 percent of the parking spaces of the same parking lot were occupied, even though only 6 cars were parked every 5 minutes.

Which of the following, if true, helps to resolve the apparent discrepancy above?
(A)Fewer cars have left the parking lot between 9 A.M. and 11 A.M. than between 7A.M. and 9 A.M.
(B)Between 9 A.M. and 11 A.M., a parking lot at a mall situated near the airport, was filled, and some people who came to the mall had to park their cars at the parking lot near the Stoneville International Airport.
(C)Fewer planes departed from Stoneville International Airport between 9 A.M. and 11 A.M. than between 7 A.M. and 9 A.M.
(D)The number of large cars parked at the parking lot near Stoneville International Airport between 9 A.M. and 11 A.M. was greater than between 7 A.M. and 9 A.M.
(E)Some of the cars that were parked before 7 A.M. left the parking lot only after 11 A.M.
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(D) does not seems wrong. (A) and (D) both look promising.

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Between 7 A.M. and 9 A.M., on average 50 percent of the park 26 Aug 2025, 11:02
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guerrero25
Between 7 A.M. and 9 A.M., on average 50 percent of the parking spaces at a parking lot near Stoneville International Airport were occupied. During these two hours approximately 8 cars were parked in the parking lot every 5 minutes. Between 9 A.M. and 11 A.M. of the same day, on average 70 percent of the parking spaces of the same parking lot were occupied, even though only 6 cars were parked every 5 minutes.

Which of the following, if true, helps to resolve the apparent discrepancy above?

(A)Fewer cars have left the parking lot between 9 A.M. and 11 A.M. than between 7A.M. and 9 A.M.

(B)Between 9 A.M. and 11 A.M., a parking lot at a mall situated near the airport, was filled, and some people who came to the mall had to park their cars at the parking lot near the Stoneville International Airport.

(C)Fewer planes departed from Stoneville International Airport between 9 A.M. and 11 A.M. than between 7 A.M. and 9 A.M.

(D)The number of large cars parked at the parking lot near Stoneville International Airport between 9 A.M. and 11 A.M. was greater than between 7 A.M. and 9 A.M.

(E)Some of the cars that were parked before 7 A.M. left the parking lot only after 11 A.M.
Show more

Ans: (A) Fewer cars have left the parking lot between 9 A.M. and 11 A.M. than between 7A.M. and 9 A.M.

The discrepancy:
  • 7–9 A.M.: higher arrival rate (8 cars / 5 min) but 50% average occupancy.
  • 9–11 A.M.: lower arrival rate (6 cars / 5 min) yet 70% average occupancy.
    To reconcile this, we need something that increases net cars (arrivals − departures) in the later window—i.e., fewer departures 9–11. That’s exactly what (A) states.
(B) Mall lot full, some mall visitors park at the airport lot.
This would increase arrivals 9–11, but the problem already fixes the arrival rate at 6 per 5 minutes. The statement can’t change a given data point; at best it repeats “there were arrivals,” which we already know. It says nothing about departures, so it doesn’t explain the higher occupancy with a lower inflow.

(C) Fewer planes departed 9–11 than 7–9.
Airport flight departures don’t directly determine parking departures. Fewer flights leaving could even imply fewer new arrivals (consistent with the given 6/5 min) but tells us nothing about how many parked cars left the lot. Without reducing car departures, this doesn’t explain higher occupancy.

(D) More large cars parked 9–11 than 7–9.
Occupancy is stated as a percentage of spaces occupied, and standard lots assign one space per car regardless of size. Unless large cars take multiple marked spaces (not stated), car size doesn’t raise the count of spaces occupied per car. So this doesn’t affect the occupancy percentage in the needed way.

(E) Some cars parked before 7 A.M. left only after 11 A.M.
This describes cars that stayed through both intervals, boosting occupancy in both periods. It doesn’t explain why occupancy was higher in the later period despite lower arrivals; we still need fewer departures specifically between 9–11.
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