The GMAT Club » Data Sufficiency http://gmatclub.com/blog MBA programs, Free GMAT Test, Admissions Consultants, and Business School - It's GMAT Club Fri, 24 May 2013 15:54:08 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 GMAT Question of the Day (May 23): Arithmetic and Critical Reasoning http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-23-arithmetic-and-critical-reasoning-2/ http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-23-arithmetic-and-critical-reasoning-2/#comments Thu, 23 May 2013 09:00:13 +0000 akkane http://gmatclub.com/blog/?p=18524 Math (DS)

a , b , and c are integers. Is abc = 0 ?

1. a^2 = 2a
2. \frac{b}{c} = \frac{(a+b)^2}{a^2+2ab+b^2} - 1 ( a \ne -b and c \ne 0 )

Question Discussion & Explanation
Correct Answer - B - (click and drag your mouse to see the answer)

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Verbal (CR)

A light bulb company produces 2,000 light bulbs per week. The manager wants to ensure that standards of quality remain constant from week to week. The manager, therefore, suggests that the company reject 500 of the 2,000 light bulbs it produces each week.

Of the following, the best criticism of the manager’s plan is that the plan assumes that

(A) light bulb manufacturers cannot market every light bulb that they produce
(B) the overall quality of the light bulbs would not be improved if the total number of light bulbs produced were reduced
(C) each light bulb that is reviewed is worthy of being reviewed
(D) it is difficult to judge the quality of a light bulb
(E) the 1,500 light bulbs that are accepted will be of the same quality from week to week

Question Discussion & Explanation
Correct Answer - E - (click and drag your mouse to see the answer)

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]]> http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-23-arithmetic-and-critical-reasoning-2/feed/ 0 GMAT Question of the Day (May 20): Algebra and Critical Reasoning http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-20-algebra-and-critical-reasoning/ http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-20-algebra-and-critical-reasoning/#comments Mon, 20 May 2013 09:00:39 +0000 akkane http://gmatclub.com/blog/?p=18510 Math (DS)

If x is a positive integer, is y^2(x^3-x+1)>75?

1. y>1
2. (x-1)^2=16

Question Discussion & Explanation
Correct Answer - C - (click and drag your mouse to see the answer)

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Verbal (CR)

Passengers must exit airplanes swiftly after accidents, since gases released following accidents are toxic to humans and often explode soon after being released. In order to prevent passenger deaths from gas inhalation, safety officials recommend that passengers be provided with smoke hoods that prevent inhalation of the gases.

Which of the following, if true, constitutes the strongest reason to require implementation of the safety officials’ recommendation?

(A) Test evacuations showed that putting on the smoke hoods added considerably to the overall time it took passengers to leave the cabin.
(B) Some airlines are willing to buy the smoke hoods even though they consider them to be prohibitively expensive.
(C) Although the smoke hoods protect passengers from the toxic gases, they can do nothing to prevent the gases from igniting.
(D) Some experienced flyers fail to pay attention to the safety instructions given on every commercial flight before takeoff.
(E) In many airplane accidents, passengers who were able to reach emergency exits were overcome by toxic gases before they could exit the airplane.

Question Discussion & Explanation
Correct Answer - E - (click and drag your mouse to see the answer)

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]]> http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-20-algebra-and-critical-reasoning/feed/ 0 GMAT Question of the Day (May 17): Algebra and Critical Reasoning http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-17-algebra-and-critical-reasoning-2/ http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-17-algebra-and-critical-reasoning-2/#comments Fri, 17 May 2013 09:00:04 +0000 akkane http://gmatclub.com/blog/?p=18376 Math (DS)

What is the value of p^3 - q^3 ?

1. p - q = 0
2. p + q = 0

Question Discussion & Explanation
Correct Answer - A - (click and drag your mouse to see the answer)

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Verbal (CR)

Excavation of the ancient city of Kourion on the island of Cyprus revealed a pattern of debris and collapsed buildings typical of towns devastated by earthquakes. Archaeologists have hypothesized that the destruction was due to a major earthquake known to have occurred near the island in A.D. 365.

Which of the following, if true, most strongly supports the archaeologists’ hypothesis?

(A) Bronze ceremonial drinking vessels that are often found in graves dating from years preceding and following A.D. 365 were also found in several graves near Kourion.
(B) No coins minted after A.D. 365 were found in Kourion, but coins minted before that year were found in abundance.
(C) Most modern histories of Cyprus mention that an earthquake occurred near the island in A.D. 365.
(D) Several small statues carved in styles current in Cyprus in the century between A.D. 300 and 400 were found in Kourion.
(E) Stone inscriptions in a form of the Greek alphabet that was definitely used in Cyrpus after A.D. 365 were found in Kourion.

Question Discussion & Explanation
Correct Answer - B - (click and drag your mouse to see the answer)

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]]> http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-17-algebra-and-critical-reasoning-2/feed/ 0 GMAT Question of the Day (May 10): Arithmetic and Critical Reasoning http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-10-arithmetic-and-critical-reasoning/ http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-10-arithmetic-and-critical-reasoning/#comments Fri, 10 May 2013 09:00:47 +0000 akkane http://gmatclub.com/blog/?p=18220 Math (DS)

If x is an integer, is x a prime number?

1. x is a multiple of a prime number
2. x is a product of two integers

Question Discussion & Explanation
Correct Answer - E - (click and drag your mouse to see the answer)

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Verbal (CR)

Air travel is becoming increasingly more dangerous. In the last year there have been seven major collisions resulting in over 700 deaths, more deaths than in any previous year.

Which statement, if true, would most weaken the argument above?

(A) Since the volume of air traffic has been increasing all the time, an increase in the number of deaths due to collisions does not necessarily mean greater danger.
(B) The increase in collisions can be explained by statistical coincidence, hijackings, and unusual weather.
(C) Mortality per passenger mile is lower for air travel than for any kind of surface transportation.
(D) The increase in deaths due to collision in air travel has proceeded at a rate identical to that for deaths in all other major forms of transportation.
(E) Last year the average number of passengers per flown plane was significantly lower than that of previous years.

Question Discussion & Explanation
Correct Answer - A - (click and drag your mouse to see the answer)

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]]> http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-10-arithmetic-and-critical-reasoning/feed/ 0 GMAT Question of the Day (May 9): Geometry and Sentence Correction http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-9-geometry-and-sentence-correction/ http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-9-geometry-and-sentence-correction/#comments Thu, 09 May 2013 09:00:34 +0000 akkane http://gmatclub.com/blog/?p=18216 Math (DS)

Points A, B, and C lie on a circle of radius 1. What is the area of triangle ABC ?

1. AB^2 = BC^2 + AC^2
2. \angle CAB equals 30 degrees

Question Discussion & Explanation
Correct Answer - C - (click and drag your mouse to see the answer)

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Verbal (SC)

Recent findings lend strong support to the theory that a black hole lies at the center of the Milky Way and of many of the 100 billion other galaxies estimated to exist in the universe.

(A) that a black hole lies at the center of the Milky Way and of
(B) that a black hole lies at the Milky Way’s center and
(C) that there is a black hole lying at the Milky Way’s center an
(D) of a black hole lying at the Milky Way’s center and
(E) of a black hole that lies at the center of the Milky Wayand of

Question Discussion & Explanation
Correct Answer - A - (click and drag your mouse to see the answer)

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]]> http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-9-geometry-and-sentence-correction/feed/ 0 GMAT Question of the Day (May 8): Statistics and Sentence Correction http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-8-statistics-and-sentence-correction/ http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-8-statistics-and-sentence-correction/#comments Wed, 08 May 2013 09:00:53 +0000 akkane http://gmatclub.com/blog/?p=18212 Math (DS)

What is x ?

1. The median of set (x, 1, -1, 3, -x) is 0
2. The median of set (x, 1, -1, 3, -x) is \frac{x}{2}

Question Discussion & Explanation
Correct Answer - A - (click and drag your mouse to see the answer)

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Verbal (SC)

Though the term “graphic design” may suggest laying out corporate brochures and annual reports, they have come to signify widely ranging work, from package designs and company logotypes to signs, book jackets, computer graphics, and film titles.

(A) suggest laying out corporate brochures and annual reports, they have come to signify widely ranging
(B) suggest laying out corporate brochures and annual reports, it has come to signify a wide range of
(C) suggest corporate brochure and annual report layout, it has signified widely ranging
(D) have suggested corporate brochure and annual report layout, it has signified a wide range of
(E) have suggested laying out corporate brochures and annual reports, they have come to signify widely ranging

Question Discussion & Explanation
Correct Answer - B - (click and drag your mouse to see the answer)

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]]> http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-8-statistics-and-sentence-correction/feed/ 0 GMAT Question of the Day (May 7): Arithmetic and Sentence Correction http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-7-arithmetic-and-sentence-correction/ http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-7-arithmetic-and-sentence-correction/#comments Tue, 07 May 2013 09:00:30 +0000 akkane http://gmatclub.com/blog/?p=18208 Math (DS)

How many distinct prime divisors does a positive integer N have?

1. 2N has one prime divisor
2. 3N has one prime divisor

Question Discussion & Explanation
Correct Answer - C - (click and drag your mouse to see the answer)

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Verbal (SC)

Deliberately imitating the technique of Louis Armstrong, jazz singer Billie Holiday’s approach to singing was to use her voice like an instrument, in that she ranged freely over the beat, flattened out the melodic contours of tunes, and, in effect, recomposed songs to suit her range, style, and artistic sensibilities.

(A) Billie Holiday’s approach to singing was to use her voice like an instrument, in that she ranged freely over the beat, flattened
(B) Billie Holiday’s approach to singing was to use her voice in a similar way to how other musicians play instruments, in ranging freely over the beat, flattening
(C) Billie Holiday approached singing by using her voice like other musicians played instruments, ranging freely over the beat, flattening
(D) Billie Holiday used her voice in the same way that other musicians use their instruments, in that she ranged freely over the beat, flattening
(E) Billie Holiday approached singing by using her voice like other musicians Instruments, ranging freely over the beat, flattening

Question Discussion & Explanation
Correct Answer - D - (click and drag your mouse to see the answer)

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]]> http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-7-arithmetic-and-sentence-correction/feed/ 1 GMAT Question of the Day (May 2): Probability and Sentence Correction http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-2-probability-and-sentence-correction/ http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-2-probability-and-sentence-correction/#comments Thu, 02 May 2013 09:00:41 +0000 akkane http://gmatclub.com/blog/?p=18046 Math (DS)

15 computers in the corporate network are infected with virus. If every day several computers are arbitrarily selected for scanning, what is the probability that no computer containing virus will be scanned in the course of the next five days?

1. 10 computers are scanned every day
2. 4% of all computers in the corporate network are scanned every day

Question Discussion & Explanation
Correct Answer - C - (click and drag your mouse to see the answer)

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Verbal (SC)

Although fruit can no longer grow once it is picked, it continues for some time to respire, taking in oxygen and giving off carbon dioxide, similar to the way human beings breathe.

(A) similar to the way human beings breathe
(B) similarly to human beings who are breathing
(C) just like the breathing of human beings
(D) as human beings when breathing
(E) just as human beings do when they breathe

Question Discussion & Explanation
Correct Answer - E - (click and drag your mouse to see the answer)

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]]> http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-2-probability-and-sentence-correction/feed/ 0 GMAT Question of the Day (May 1): Overlapping Sets and Sentence Correction http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-1-overlapping-sets-and-sentence-correction/ http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-1-overlapping-sets-and-sentence-correction/#comments Wed, 01 May 2013 09:00:28 +0000 akkane http://gmatclub.com/blog/?p=18042 Math (DS)

Among the first ten cyclists who crossed the finish-line, 4 were Italians and 8 represented Telefonica team. How many cyclists who represented Telefonica team and finished in the top ten were not Italians?

1. 2 Italians who finished in the top ten did not represent Telefonica team
2. Each of the top ten finishers either was an Italian or represented Telefonica team or both

Question Discussion & Explanation
Correct Answer - D - (click and drag your mouse to see the answer)

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Verbal (SC)

With total sales of less than three hundred thousand dollars and fewer new subscribers than last year, the New England Theater Company is in danger of losing its building.

(A) of less than three hundred thousand dollars and fewer
(B) lower than three hundred thousand dollars and less
(C) lesser than three hundred thousand dollars and fewer
(D) fewer than three hundred thousand dollars and less
(E) of fewer than three hundred thousand dollars and of fewer

Question Discussion & Explanation
Correct Answer - A - (click and drag your mouse to see the answer)

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]]> http://gmatclub.com/blog/2013/05/gmat-question-of-the-day-may-1-overlapping-sets-and-sentence-correction/feed/ 0 GMAT Question of the Day (Apr 30): Algebra and Critical Reasoning http://gmatclub.com/blog/2013/04/gmat-question-of-the-day-apr-30-algebra-and-critical-reasoning/ http://gmatclub.com/blog/2013/04/gmat-question-of-the-day-apr-30-algebra-and-critical-reasoning/#comments Tue, 30 Apr 2013 09:00:05 +0000 akkane http://gmatclub.com/blog/?p=18037 Math (DS)

Is A positive?

1. x^2 - 2x + A is positive for all x
2. Ax^2 + 1 is positive for all x

Question Discussion & Explanation
Correct Answer - A - (click and drag your mouse to see the answer)

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Verbal (CR)

Some good cooks are gourmet cooks who pride themselves on always using extravagantly rich ingredients in elaborate recipes. Some good cooks can be characterized as fast-food cooks. They may use rich ingredients as long as the recipes are easy to follow and take little time. Other good cooks are health food enthusiasts, who are concerned primarily with the nutritional value of food. But even though not all good cooks are big eaters, they all enjoy preparing and serving food.

If the information in the passage is true, which one of the following CANNOT be true?

(A) Most good cooks do not use extravagantly rich ingredients.
(B) Everyone who enjoys preparing and serving food is a good cook.
(C) More good cooks who use extravagantly rich ingredients are big eaters than are good cooks who do not use such ingredients.
(D) There are fewer good cooks who enjoy serving and preparing food than there are good cooks who are big eaters.
(E) Gourmet cooks, fast-food cooks, and cooks who are health food enthusiasts are all big eaters.

Question Discussion & Explanation
Correct Answer - D - (click and drag your mouse to see the answer)

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