Max@Math Revolution wrote:Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.
x-y=?
1) (x-y)^5=32
2) |x-y|=2
In the original condition and the question,
x-y=?
For 1), x-y=2
For 2), x-y=-2,2
Thus, 1) is unique and sufficient. The answer is A.
� Once we modify the original condition and the question according to the variable approach method 1, we can solve approximately 30% of DS questions.
To avoid any confusion among the forum members, you might want to explain what you mean
in blue above.
First of all, you suggest that one need not actually solve the equation, but in your solution, you did, indeed, solve each equation.
Second, You say that an
equal number of variables and independent equations ensures a solution. Since each statement provides one equation with two variables, some might be confused that one statement is sufficient while the other is not sufficient.
Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
