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In this GMAT video, Rich begins by presenting a sample DS question. 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.

In addition, they provide a helpful recap of all the tips covered in this quantitative strategy lesson — if you haven’t watched all the videos, be sure to check them out!