21 • Q. What is the Rule of Three £ Ji. It teaches by three numbers, which are always given in the question, to find a fourth. Q. How is the Rule generally divided ? Ji. Into Direct and Inverse Proportion. What is Direct Proportion ? JI. Direct Proportion is when more requires more, or less requires less. As it will require more men to perform more work, or fewer men for less work in the same time. Q. What is Inverse Proportion ? JI. Inverse Proportion is when more requires less, or less requires more. As it will require more men to perform the same work in less time, or fewer men in more time. 0. What is Compound Proportion ? A. Compound Proportion is so called because it teaches to solve such questions as require two or more statings by the Single Rule of T^iree. Is Proportion a very useful Rule ? JL Yes, both in Arithmetic and Mathematics, and therefore it has been called the Golden Rule.
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