GMAT® Math | Official Guide 2017 | Data Sufficiency

Use the ad-bce split to determine data sufficiency in data sufficiency questions. Simplify the initial information, assess what is needed, and apply the flowchart to test statements alone or together.

Understand data sufficiency in GMAT math by analyzing whether given distance and time suffice to determine a car’s average rate, without performing unnecessary calculations.

Identify data sufficiency strategies for GMAT math: use flow chart to assign a or d for sufficiency and b, c, or d for insufficiency, aiming for two contradictory conclusions.

Solve data sufficiency geometry questions in real time using external angles and alpha plus beta logic. Learn to test sufficiency by stretching figures to extremes.

Evaluate data sufficiency problems by breaking verbal expressions into manageable parts, analyzing overlap between chemistry and biology, and using a number line to test for sufficient information and contradicting conclusions.

Apply a quick percent rule to treat percent as division by 100. Read relative expressions as linked to the directly related quantity to assess sufficiency without solving.

Spot a data-sufficiency item as arithmetic by noting a constant difference, then apply a_n = a1 + (n-1)d to assess sufficiency when combining statements.

Analyze a GMAT® data sufficiency question on which is greater, u^v or v^u, by using the equilibrium of powers and plugging numbers to test sufficiency.

This GMAT data-sufficiency lecture explains solving an arithmetic-sequence problem by using a known term and the common difference to find other terms, and evaluates statements 1 and 2.

Examine a data-sufficiency problem on donations expressed as a percent of annual profits, showing that combining two statements yields a definite yes/no on whether the donation exceeds ten thousand.

Assess data sufficiency for the slope of k by evaluating statements 1 and 2, sketching the data, noting contradictions, and concluding that positive versus nonpositive slope makes the data insufficient.

Combine the width and height statements to determine feasibility, and learn why the GMAT data-sufficiency yes-no question yields answer C in the truck cross-section.

Explore a GMAT data sufficiency problem about whether a fraction is less than 9/11, using multipliers and sign rules. Compare fractions and decimals to show that statement two is sufficient.

Explore a data sufficiency GMAT question linking fuel consumption to speed with the equation kv^2, determine when it equals one third, and show that either statement 1 or 2 suffices.

Explore data sufficiency in GMAT style by evaluating cotton quantities and per-jacket fabric requirements to determine if more than 1,050 jackets can be produced.

Learn data sufficiency techniques to compute the discount percent when the before price is 25 percent greater than the after price.

Analyze a data sufficiency question by simplifying to compare bases with negative powers, then test statements using values like 0 and 1 to determine sufficiency.

Explore a data sufficiency GMAT problem where total cost equals a fixed sum plus a charge beyond 420 minutes. Statement 1 is not sufficient; statement 2 is sufficient; answer B.

This lecture shows solving a GMAT data-sufficiency problem using the average to total items, applying 6% tax on prices over 80, and why statements 1 and 2 yield insufficient data.

Solve a data sufficiency problem on offers from two companies, using probability rules for or (sum) and (product), to determine P(both) and arrive at option C.

Explore standard deviation and its relation to the average in a GMAT data sufficiency problem, showing that statement two alone suffices when all nests hold equal eggs.

Identify that z appears in xz and yz, making a fraction potentially undefined. Use the common factor and statement 1, 2x+1=3, to test sufficiency of x, y, and z.

Express different bases as powers of the same base, set 2^(x+y) = 2^30 to get x+y=15, then combine the two statements to confirm data sufficiency for x and y.

Assess data sufficiency for a GMAT problem on whether a glass sheet covers a table top. Examine table dimensions, glass area, and how combining statements changes coverage conclusions.

Analyze data-sufficiency for inequalities by plugging in numbers and testing contradictions, using two contradictory conclusions. Conclude that statement 2 is sufficient and statement 1 is insufficient, with the answer B.

Apply data sufficiency techniques in GMAT math to bound x and y using fractions and percentages, and learn how combining statements yields clear conclusions.

Plug in convenient numbers to test data sufficiency for x and y under the positive and inequality constraints, using symmetry around ten and variable isolation.

Demonstrate how two linear equations resolve a two-variable ride-cost problem in a data-sufficiency context, where neither statement alone is sufficient but combined they become solvable.

Analyze a GMAT data-sufficiency problem on the ratio of students to district size, showing that combining statements can still be insufficient due to a 10,000 difference.

Explore how to test data sufficiency by evaluating statements separately, plugging in convenient numbers, and combining them to determine sufficiency for distance and squared relationships, including negative or positive distances.

Map the scholarships and loans groups on a number line to find their overlap and the neither portion, then test each statement's sufficiency using the given percentages.

Explore a data-sufficiency problem with coins b and c, using b = 1.5 c and a total between 21 and 28; deduce c equals 10 by combining statements.

Solve a GMAT data sufficiency problem by analyzing percent shares and a 40 percent revenue increase for jazz and blues; use statement 2 to derive a solvable equation.

Examine data sufficiency using opposite numbers and distance to zero, testing statements about q, s, r, and t to determine when r is closest to zero.

Examine a GMAT data-sufficiency weighted-average problem, showing why four data items are needed and why 120 and 126 are insufficient to find the fifth value, via inverse ratios.

Learn how to solve data sufficiency questions with two bases and exponents, simplify power-of-a-power scenarios to x+y=16, and assess statements about x and y using linear equations.

Examine a data sufficiency GMAT problem with a basic amount plus 5 percent commission and 10 percent of sales. Use statements to form a solvable single equation with one unknown.

Explore a GMAT data sufficiency question on two simple-interest investments totaling 16,000, and show how statements alone fail but combined yield x, using ratios to relate x and y.

Review data sufficiency tactics for GMAT math using a bakery word problem, showing how a single equation with two variables yields a value and tests statement sufficiency.

Decide if a fraction terminates by reducing it and checking the denominator for only powers of 2 and 5; a factor of 100 for r suffices.

Analyze a data-sufficiency problem on k between 57 and 65, where k is odd and k+1 is divisible by 3, yielding multiple possible values and making the data insufficient.

Analyze a GMAT data sufficiency problem to determine x+y using integer constraints, single-value deduction, and the sufficiency of statements, concluding x+y equals 7 with consistent reasoning.

The lecture demonstrates data-sufficiency for a GMAT data problem about mortgage, taxes, and insurance totaling 12000, guiding students to identify sufficiency through variable relationships and percentage hints.

Explain how the bracket of x represents the least integer greater than or equal to x and how rounding up informs data sufficiency, with the answer C.

Analyze a data sufficiency GMAT question from the official guide using row and column rules to deduce three appears once. Conclude data are sufficient, with the correct answer D.

Explore data sufficiency on the GMAT with k and m, counting factors of two, and determine why statement 1 is insufficient while statement 2 is sufficient by plugging in numbers.

In this GMAT data sufficiency lecture, learn how median and average relate to a set of house prices. Statement two sets Jane’s price at 120, making the median 120.

explains using parity to decide data sufficiency for x and y, showing an even product comes from at least one even factor, and analyzes statements 1 and 2.

Learn that in an ordered set with constant difference, the average equals the median, and evaluate data-sufficiency statements showing each condition can determine the correct choice.

Solve two equations to locate the intersection of the lines, then substitute the coordinates into the third line to find B. Both statements alone are sufficient.

Learn data sufficiency strategies for division questions by choosing convenient numbers, such as 60, to test shipment values and determine whether shipment three belongs to truck one.

Explore GMAT data sufficiency by linking profit to revenue and expenses, then bound unit sales using price per unit and total revenue through inequalities.

Evaluate data sufficiency by testing statements 1 and 2 about numbers around 75. Analyze averages, potential contradictions, and the role of standard deviation to determine sufficiency.

This lecture demonstrates using simple benchmarks and a weighted average to decide if the overall GMAT data-sufficiency problem's average is under 120, analyzing two statements to determine sufficiency.

Apply data-sufficiency reasoning to a GMAT problem, using scientific notation and orders of magnitude to deduce a single positive value for k, with even-root extraction and benchmarks for estimation.

Explore a data-sufficiency GMAT problem where production is directly proportional to a constant ratio. Statement 1 is insufficient, while statement 2 is sufficient.

Analyze a data sufficiency question with two equations in x and t, showing that statement 1 suffices while statement 2 does not.