On data sufficiency GMAT problems all the drawings are useless in solving the problem. Also remember TIME is of the essence. If you written down more than three rows of formulas for any GMAT problem … STOP … click on any answer and move on. The closer you think you are to the answer, the more time you loose!
If a question asks “what is x?” it means: can a single value for x be found?
For data sufficiency GMAT problems, when see the word “percent” think part/whole
For a data sufficiency statement to be sufficient there must be as many equations as there are variables.
- A single equation with two variables cannot be solved
- Two distinct equations with the same two variables can be solved, using simultaneous equations
Just because there is only one variable does not mean an equation has just one solution.
- An equation with a variable raised to an even power may have more than one solution
- An equation with a variable raised to an odd power will have only one solution
Data sufficiency yes or no: if a statement answers the question in the affirmative or in the negative, it is sufficient.
The answer can be no!!!
Never assume!!!
Just because one statement seems to agree with the other does not mean they are necessarily saying the same thing. !!!
When you look at Statement 2 always cover up Statement 1 and think like you never saw it. !!!
