一个比率ratio可以表示成许多方式，例如：the ratio of 2 to 3可以被表达为2 to 3，2：3，或者2/3。注意比率中的中项的顺序是重要的，即2 to 3和3 to 2不同。今天我们就来说一下GMAT数学比率与比例、百分比。
A ratio expresses a mathematical relationship between two quantities.A percent(%) is a ratio in which the second quantity is 100.A proportion is an equation is which two ratios are set equal to each other.
例题：OG13-P155-25Of the 50 researchers in a workgroup, 40 percent will be assigned to Team A and the remaining 60 percent to Team B. However, 70 percent of the researchers prefer Team A and 30 percent prefer Team B. What is the lowest possible number of researchers who will NOT be assigned to the team they prefer?
A 15
B 17
C 20
D 25
E 30
解析：已知50个人，40%被安排到A，剩下的60%被安排到B。但实际上，70%想去A，30%想去B，问最少有多少被安排到他们不想去的组?最少，安排到的B的都是想去B的，想去A的有40%安排到A组，其余的安排到B组，也就是30%的人被安排到他们不想去的组，即50*30%=15 选A
例题：OG13-P153-11When Leo imported a certain item, he made a 7 percent import tax on the portion of the total value of the item in excess of $1,000. If the amount of the import tax that Leo paid was $87.50, what was the total value of the item?
A$1,600
B$1,850
C$2,250
D$2,400
E$2,750
解析：Leo买了一个商品，超出商品价格1000元的部分要交7%的税。Leo交了87.5元的税，问这个商品多少钱?设为x，那么7%(x-1000)=87.5所以x=2250 选C
》》点击了解GMAT数学百分比讲解
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