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GMAT Reasoning — practice by topic

Browse 115 questions across 2 Reasoning topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Reasoning topics

Data Interpretation (66)Data Sufficiency (49)

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What is x? I: 2x + 3 = 11. II: x is an even number.Read the answer and worked solution →Find y. I: y is a prime number. II: y lies between 10 and 14.Read the answer and worked solution →Find x and y. I: x + y = 10. II: x - y = 2.Read the answer and worked solution →Is n even? I: n + 1 is odd. II: n is a multiple of 3.Read the answer and worked solution →

Worked practice questions

What is x? I: 2x + 3 = 11. II: x is an even number.

  1. Both together needed
  2. Neither, even together
  3. I alone suffices
  4. II alone suffices
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Correct answer: C. I alone suffices

Statement I gives 2x = 8 so x = 4; an even number alone leaves many values.

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Find y. I: y is a prime number. II: y lies between 10 and 14.

  1. II alone suffices
  2. Both together needed
  3. Neither, even together
  4. I alone suffices
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Correct answer: C. Neither, even together

Both 11 and 13 are prime and lie between 10 and 14, so y is still not fixed.

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Find x and y. I: x + y = 10. II: x - y = 2.

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

Correct answer: D. Both together needed

Two independent equations in two unknowns give x = 6 and y = 4 only when used together.

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How to practise

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