GMAT数学-比率和比例
Ratio and Proportion(比率和比例)
GMAT ratio problems sometimes involve a whole divided into two or more parts, where your task is to determine either(1)the size of one of the parts(2)the size of the whole. You can solve these problems by setting up algebraic equations.
一个比率(ratio)可以表示成许多方式，例如:the ratio of 3 to 4可被表达为3 to 4, 3 : 4或3/4。注意比率中项的顺序是重要的.即3 to 4和4 to 3不同.
A proportion is simply a statement that two ratios are you can express ratios as fractions. you can express a proportion as an equation-for /27=2/ one of the four terms is missing from the proportion. you can solve for the missing term using algebra.去看看GMAT数学-分数的性质
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