Here are the directions for GMAT Data Sufficiency. You have to decide whether the data given in the statements are sufficient for answering the question. All numbers used are real numbers. . Lines shown as straight can be assumed to be straight and lines that appear jagged can also be assumed to be straight. . You may assume that positions of points, angles, regions, etc., exist in the order shown and that angle measures are greater than zero. .
All figures lie in a plane unless otherwise indicated. .
If the data sufficiency problem asks you for the value of a quantity the data given in the statements are sufficient only when it is possible to determine exactly one numerical value for the quantity. . To review these directions for subsequent questions of this type, click on HELP. . As you consider each of the two numbered statements independently of each other, ask yourself whether the statement provides any such information. This problem involves the concept of proportion . Notice that no arithmetical calculations are required here.