QUESTION: 249

It takes Avery 3 hours to build a brick wall while Tom can do it in 2.5 hours. If the two start working together and after an hour Avery leaves, how much time will it take Tom to complete the wall on his own?

25 minutes.
30 minutes.
40 minutes.
55 minutes.
1 hour and 20 minutes.

Answer(s): C

Explanation:

The output of Avery is 1/3 walls in one hour and the output of Tom is 2/5 walls in one hour.
The two worked together for one hour, their combined output is (1/3 + 2/5 = 11/15) wall and that’s the fraction of the wall that they completed together.
Tom has (1 – 11/15 = 4/15) wall left, with his current output it will take him ((4/15) / (2/5) = 2/3) hours, which is 40 minutes.

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QUESTION: 250

There are three foam generators in the factory, the first two can generate 14 liters of foam in one hour and the third can generate 18 liters in an hour. The three generators start working together at the same time and after one hour and a half one of the first generators stops working and two hours after that the third generator stops working and only one generator is left. If 5 hours after they all started to work the last generator stops working, how many liters of foam were generated?

120.
132.
146.
154.
166.

Answer(s): D

Explanation:

In the first hour and a half all the generators worked and produced (14 + 14 + 18) x (1.5) = (69) liters. In the next two hours two generators worked and produced (14 + 18) x (2) = (64) liters.
The rest of the time (5 – 1.5 – 2 = 1.5 hours) only one generator worked and produced (14 x 1.5 = 21 liters of foam).
The total amount of foam that was created is (69 + 32 + 21 = 154 liters).

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QUESTION: 251

Mike, Jim and Bob are all professional fisherman. Mike can catch 21 fish in one hour, Jim can catch twice as much and Bob can catch 50% more than Jim. If the three started to fish together and after 40 minutes Mike and Bob left, how many fish did the three fishermen catch in one hour?

64.
72.
86.
98.
112.

Answer(s): D

Explanation:

Mike can catch 21 fish in one hour, Jim can catch 42 fish in one hour and Bob can catch (1.5 x 42 = 63 fish) in one hour. 40 minutes is 2/3 of an hour.
After 2/3 hours they all caught (21 + 42 + 63) x (2/3) = 84 fish.
In the next 1/3 hour that’s left, Jim is left alone and so he can catch (1/3 x 42 = 14) fish. The total number of fish that they caught is (84 + 14 = 98).

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QUESTION: 252

A certain church bell rings the bell twice at half past the hour and four times at the hour plus an additional number of rings equal to what ever time it is. How many rings will the clock make from 6:20 in the morning to 10:10 in the morning?

Answer(s): D

Explanation:

Let’s start from the top. The first two rings will be at 6:30 from there there’ll be 2 rings ever half past the hour until ten, at 7:30, 8:30 and 9:30. That will sum up to 8 rings total.
The bell will also ring at 7:00 8 rings, at 8:00 9 rings, at 9:00 10 rings and at 10 11 rings.
The total number of rings is: 8 + 8 + 9 + 10 + 11 = 46 rings.

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Free GMAT SECTION 2: QUANTITATIVE Exam Braindumps (page: 63)

QUESTION: 249

Explanation:

QUESTION: 250

Explanation:

QUESTION: 251

Explanation:

QUESTION: 252

Explanation: