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Data Sufficiency
Data Sufficiency questions do not ask you to solve — they ask whether you could solve. Each question gives a prompt and two statements, and the five answer choices are always the same: statement 1 alone, statement 2 alone, both together, either alone, or neither. That fixed structure is learnable, and it is where most test takers leak points early on. Practice the AD/BCE elimination habit, resist the urge to compute all the way to a value, and watch for the classic traps: statements that smuggle in hidden constraints, and "obviously sufficient" statements that fail on negatives, zero, or fractions.
Official GMAT Data Sufficiency questions — decide whether the statements are enough to answer.·Show:203050
605-655 (Medium)
For a basic monthly fee of F yen (¥F), Naoko's first cell phone plan allowed him to use a maximum of 420 minutes on calls during the month. Then, for each of x additional minutes he used on calls, he was charged ¥M, making his total charge for the month ¥T, where T=F+xM. What is the value of F?
(1) Naoko used 450 minutes on calls the first month, and the total charge for the month was ¥13,755.
(2) Naoko used 400 minutes on calls the second month, and the total charge for the month was ¥13,125.
555-605 (Medium)
If p is the perimeter of rectangle Q, what is the value of p?
(1) Each diagonal of rectangle Q has length 10.
(2) The area of rectangle Q is 48.
605-655 (Medium)
Is the sum of the prices of the 3 books that Shana bought less than $48?
(1) The price of the most expensive of the 3 books that Shana bought is less than $17.
(2) The price of the least expensive of the 3 books that Shana bought is exactly $3 less than the price of the second most expensive book.
505-555 (Easy)
What is the perimeter of isosceles triangle MNP?
(1) MN = 16
(2) NP = 20
605-655 (Medium)
If Elena spent a total of $720 on newspapers, magazines, and books last year, what amount did she spend on newspapers?
(1) Last year, the amount that Elena spent on magazines was 80 percent of the amount that she spent on books.
(2) Last year, the amount that Elena spent on newspapers was 60 percent of the total amount that she spent on magazines and books.
555-605 (Medium)
Each gift certificate sold yesterday by a certain bookstore cost either 10or50. If yesterday the bookstore sold more than 5 gift certificates that cost $50 each, what was the total number of gift certificates sold yesterday by the bookstore?
(1) Yesterday the bookstore sold fewer than 10 gift certificates that cost $10 each.
(2) The total cost of gift certificates sold yesterday by the bookstore was $460.
605-655 (Medium)
Of the 800 sweaters at a certain store, 150 are red. How many of the red sweaters at the store are made of pure wool?
(1) 320 of the sweaters at the store are neither red nor made of pure wool.
(2) 100 of the red sweaters at the store are not made of pure wool.
555-605 (Medium)
Terry holds 12 cards, each of which is red, white, green, or blue. If a person is to select a card randomly from the cards Terry is holding, is the probability less than 1/2 that the card selected will be either red or white?
(1) The probability that the person will select a blue card is 1/3
(2) The probability that the person will select a red card is 1/6
605-655 (Medium)
A certain computer company produces two different monitors, P and Q. In 2010, what was the net profit from the sale of the two monitors?
(1) Of the company's expenses in 2010, rent and utilities totaled $500,000.
(2) In 2010, the company sold 50,000 units of Monitor P at $300 per unit and 30,000 units of Monitor Q at $650 per unit.
555-605 (Medium)
Can a certain rectangular sheet of glass be positioned on a rectangular tabletop so that it covers the entire tabletop and its edges are parallel to the edges of the tabletop?
(1) The tabletop is 36 inches wide by 60 inches long.
(2) The area of one side of the sheet of glass is 2,400 square inches.
605-655 (Medium)
A conveyor belt moves bottles at a constant speed of 120 centimeters per second. If the conveyor belt moves a bottle from a loading dock to an unloading dock, is the distance that the conveyor belt moves the bottle less than 90 meters? (1 meter =100 centimeters)
(1) It takes the conveyor belt less than 1.2 minutes to move the bottle from the loading dock to the unloading dock.
(2) It takes the conveyor belt more than 1.1 minutes to move the bottle from the loading dock to the unloading dock.
Sub 505 (Easy)
A taxi company charges f cents for the first mile of the taxi ride and m cents for each additional mile. How much does the company charge for a 10-mile taxi ride?
(1) The company charges $0.90 for a 2-mile ride.
(2) The company charges $1.20 for a 4-mile ride.
605-655 (Medium)
In a product test of a common cold remedy, x percent of the patients tested experienced side effects from the use of the drug and y percent experienced relief of cold symptoms. What percent of the patients tested experienced both side effects and relief of cold symptoms?
(1) Of the 1,000 patients tested, 15 percent experienced neither side effects nor relief of cold symptoms.
(2) Of the patients tested, 30 percent experienced relief of cold symptoms without side effects.
505-555 (Easy)
The average (arithmetic mean) price of the 3 items that Kate purchased from a clothing store was 50.Iftherewasnosalestaxonanyitemthathadapriceoflessthan80 and 6 percent sales tax on all other items, what was the total sales tax on the 3 items that Kate purchased?
(1) The price of the most expensive item that Kate purchased from the store was $100.
(2) The price of the least expensive item that Kate purchased from the store was $10.
605-655 (Medium)
Three roommates—Bela, Gyorgy, and Janos—together saved money for a trip. The amount that Bela saved was equal to 8% of his monthly income. The amount that Gyorgy saved was exactly 31 of the total amount saved by all 3 roommates. What was the total amount saved for the trip by all 3 roommates?
(1) Bela had a monthly income of $2,000.
(2) Janos saved 1.5 times as much for the trip as Bela.
505-555 (Easy)
On a certain date, Hannah invested $5,000 at x percent simple annual interest and a different amount at y percent simple annual interest. What amount did Hannah invest at y percent simple annual interest?
(1) The total amount of interest earned by Hannah's two investments in one year was $900.
(2) Hannah invested the $5,000 at 6 percent simple annual interest.
605-655 (Medium)
In each game of a certain tournament, a contestant either loses 3 points or gains 2 points. If Pat had 100 points at the beginning of the tournament, how many games did Pat play in the tournament?
(1) At the end of the tournament, Pat had 104 points.
(2) Pat played fewer than 10 games.
505-555 (Easy)
Carmen currently works 30 hours per week at her part-time job. If her gross hourly wage were to increase by $1.50, how many fewer hours could she work per week and still earn the same gross weekly pay as before the increase?
(1) Her gross weekly pay is currently $225.00.
(2) An increase of $1.50 would represent an increase of 20 percent of her current gross hourly wage.
605-655 (Medium)
At the beginning of the year, the Finance Committee and the Planning Committee of a certain company each had n members, and no one was a member of both committees. At the end of the year, 5 members left the Finance Committee and 3 members left the Planning Committee. How many members did the Finance Committee have at the beginning of the year?
(1) The ratio of the total number of members who left at the end of the year to the total number of members at the beginning of the year was 1:6.
(2) At the end of the year, 21 members remained on the Planning Committee.
605-655 (Medium)
Some computers at a certain company are Brand X and the rest are Brand Y. If the ratio of the number of Brand Y computers to the number of Brand X computers at the company is 5:6, how many of the computers are Brand Y?
(1) There are 80 more Brand X computers than Brand Y computers at the company.
(2) There is a total of 880 computers at the company.