Data sufficiency questions consist of a question followed by two statements. Your job is to decide whether the information in the statements (taken singly or together) is sufficient to answer the question.
These questions require much less calculation than standard problem solving: evaluate rather than calculate.
Practice the minitests and study the explanations for the ones you get wrong. The explanations will make the method clearer.
Each test has ten questions and should take 12 minutes.
Remember that variables (x, y etc.) can be positive, negative, zero or fractions, unless the question states otherwise.
Each problem consists of a problem followed by two statements. Decide whether the data in the statements are sufficient to answer the question. Select your answer according to whether:
What is the value of x?
From statement 1, x = 6 or -6
From statement 2, x = 0 or 6
The answer is C because when the information from both statements is taken together x = 6
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