Nonstandard notation is used only when it is explicitly defined in a particular question. A question may be posed in either English or metric units of measure. Neither the knowledge required for converting units in one system to units in another system, nor the ability to convert from one unit to another in the same system, is tested. If an answer to a question is expected to be in a unit of measure different from the unit in which the question is posed, a relationship between the units is provided unless the relationship is a common one, such as minutes to hours. The following information on numbers and figures applies to all questions in the quantitative sections.
All numbers used are real numbers.
Lines shown as straight can be assumed to be straight. Figures can be assumed to lie in a plane unless otherwise indicated. Figures that accompany questions are intended to provide information useful in answering the questions. However, unless a note states that a figure is drawn to scale, you should solve these problems not by estimating sizes by sight or by measurement, but by using your knowledge of mathematics. Some facts about arithmetic that might be helpful.