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GMAT Data Sufficiency — practice questions — page 2

Explore 49 free Data Sufficiency questions in GMAT Reasoning. Open each question or exercise to read its content, reference answers and available explanation.

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Data Sufficiency questions and exercises with answers

Showing questions 31–49 of 49.

Class strength? I: 30% are girls. II: There are 21 boys.Read the answer and worked solution →How is A related to B? I: A is B's mother's brother. II: B is a girl.Read the answer and worked solution →Is Q the father of R? I: Q is male. II: R is Q's child.Read the answer and worked solution →Sides of a regular polygon? I: Each interior angle is 140 degrees. II: Exterior angles total 360.Read the answer and worked solution →Is y greater than x? I: y = x + 3. II: x is a positive integer.Read the answer and worked solution →Is integer n positive? I: n squared equals n. II: n is not zero.Read the answer and worked solution →Is every A a C? I: Every A is a B. II: Every B is a C.Read the answer and worked solution →Is some A a C? I: All A are B. II: Some B are C.Read the answer and worked solution →Find the two-digit number. I: Digits add to 9. II: Reversing adds 27 to it.Read the answer and worked solution →Is the point (a, b) in the first quadrant? I: a > 0. II: b > 0.Read the answer and worked solution →What does a data sufficiency question ask the test taker to decide?Read the answer and worked solution →A system with fewer equations than unknowns is generally called what?Read the answer and worked solution →Generally, two independent equations in two unknowns give how many solutions?Read the answer and worked solution →A linear system with no solution at all is called what?Read the answer and worked solution →An inconsistent linear system can always be rewritten as which statement?Read the answer and worked solution →What do independent equations each provide about the variables?Read the answer and worked solution →Removing one independent equation does what to the solution set?Read the answer and worked solution →Generally, with 5 unknowns and 3 independent equations, solution set dimension?Read the answer and worked solution →Three distinct parallel planes in space have what solution set?Read the answer and worked solution →

Worked practice questions

Class strength? I: 30% are girls. II: There are 21 boys.

  1. I alone suffices
  2. II alone suffices
  3. Neither, even together
  4. Both together needed
Show answer and solution

Correct answer: D. Both together needed

Boys are 70% of the class, so 21 divided by 0.7 gives 30 students.

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How is A related to B? I: A is B's mother's brother. II: B is a girl.

  1. II alone suffices
  2. I alone suffices
  3. Both together needed
  4. Neither, even together
Show answer and solution

Correct answer: B. I alone suffices

A mother's brother is the maternal uncle whatever B's gender is.

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Is Q the father of R? I: Q is male. II: R is Q's child.

  1. Both together needed
  2. I alone suffices
  3. II alone suffices
  4. Neither, even together
Show answer and solution

Correct answer: A. Both together needed

A male parent is a father, so the child link and the gender are both required.

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Data Interpretation