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GRE Quantitative Comparison practice

Twenty original Quantitative Comparison questions, with the four-choice answer format and the cases that make cannot be determined the right answer. Full solutions for every one. Free, no signup.

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Quantitative Comparison practiceEasy
Question 1 of 20
Compare the two quantities.

Choose A if Quantity A is greater, B if Quantity B is greater, C if the two quantities are equal, or D if the relationship cannot be determined from the information given.

Quantity A
of
Quantity B
of
How to approach it

A method for Quantitative Comparison.

Know the four choices cold

Quantity A greater, Quantity B greater, the two equal, or the relationship cannot be determined. The fourth option is the one most people forget when a variable is unconstrained.

Test boundary and special values

Try 0, 1, a negative, and a fraction. If two valid values give different comparisons, the answer is D, cannot be determined.

Compare, do not compute

You rarely need the exact values. Simplify both quantities the same way, or subtract one from both, until the comparison is obvious.

Questions

Quantitative Comparison, answered.

Quantity A is greater, Quantity B is greater, the two are equal, or the relationship cannot be determined from the information given.
When the quantities involve a variable that can take values giving different comparisons. If you can find two cases that disagree, the answer is D.
Yes, and you should, but test several kinds: zero, one, negatives, and fractions. One example is not enough to prove A, B, or C.
Not necessarily. Use the stated values and relationships, not the look of the figure.