About GMAT Problem Solving
Problem Solving questions are the most straight forward on the GMAT. They are similar to the math questions on the SAT, ACT, and other standardized tests. The question provides some background information and proceeds to ask the test-taker to arrive at an answer by performing a series of calculations. The range of mathematical topics tested on the GMAT math section (both problem solving and data sufficiency questions) is limited to high school mathematics. The GMAT does not test on trigonometry or calculus. Instead, the GMAT relies on clever applications of basic math concepts to differentiate average students from their top-tier colleagues. (See the GMAT Study Guide for more clarity on which topics are tested and how they are tested.)
For a better idea of what GMAT problem solving questions are like, examine the practice question set, where you will find numerous sample problems with detailed answer explanations. Although there is no substitute for knowing the fundamentals of mathematics, the Platinum Techniques can be helpful in correctly solving questions.