4).X FOR QUESTIONS THAT REQUIRE APPROXIMATIONS, SCAN THE ANSWER( ) 4....

4).x For questions that require approximations, scan the answer

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4. Dividing both sides of the3− 12 +14 =1− 12+ 13 1− 1 choices to get some idea of the required closeness of approxima-1− 1equation by tion; otherwise you may waste time on long computations when a4 (which is not zero) gives the resultingshort mental process would be sufficient (for example, finding 48percent of a number when taking half of the number would give aequation 3=1. Thus x = 3 and the best answer is (A).close enough approximation).Some examples of problem solving questions involving data

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analysis, with explanations, follow.