GRE Quant Questions often require knowledge of multiple math concepts. How you relate the concepts to each other is often the key to solving the problems. Consider the following question of the day:

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This problem tests your proficiency in 3 different skills:

1. Sum of the internal angles of a triangle is 180 degrees.
2. Solving a linear equation.
3. The pythgorean theorem.

Your knowledge of any one skill in isolation will not get you anywhere. You need to connect the dots to solve the problem.