GRE Quantitative Comparison

Quantitative comparison questions ask you to compare a quantity in Column A to the quantity in Column B. There are always four answer choices:

  1. The quantity in Column A is bigger than the quantity in Column B
  2. The quantity in Column B is bigger than the quantity in Column A
  3. The quantity is Column A is equal to the quantity in Column B.
  4. The relationship cannot be determined from the given information.

Sometimes the quantities in Columns A and B are straight forward, as for example when Column A = 10.01 and Column B = 1.001, so the value in Column A is bigger than the value in Column B by simple comparison.

Other times, however, the values in Columns A and B are not straight-forward and actually involve variables, and there may also be additional information that is given which you must consider when answering the question. For example, if Column A = 3x and Column B = 2x and x is an integer, notice that the relationship between the values in the two columns cannot be determined because if x is less than 1, then Column B is greater, but if x is greater than 1, then Column A is greater. However, for example if you are told that x is greater than 1, then you know that Column A is greater.