GMAT On Demand: Solving for One Variable Among Many in DS Questions

by Knewton, Mar 12, 2011

In this video, Rich begins by presenting a sample DS question. To try it out, just hit pause! The question tests your ability to solve for the value of an expression -- without necessarily solving for the variables in that expression:

Jess and Rich then go on to explain the best way to solve for one variable in DS problems in which you are given more variables than equations.

For more DS tips, check out the rest of the installments of this quantitative strategy lesson:

• Dont Solve Data Sufficiency Problems
• Testing Cases in Data Sufficiency
• How to Simplify Data Sufficiency Problems
• Three Classic DS Problems Involving Systems of Equations
• The Basics of Independent and Dependent Equations
• How to Solve for the Value of an Expression (Without Solving for its Variables!)