Math Problem 3

Given: x+y=1

Compare two values:

Column A	Column B
xy	1

Solution for GRE Math Problem 2:

This question is a bit tricky. Of course, we can see, that 65% of $100 is $65, and 2/3 of $100 is $66.(6). But if a=0 then both values become equal. So, as no restrictions for a are given, in general we can't define which column is bigger.

Answer: D, it is impossible to determine which quantity is greater

See also these GRE problems: