又想起seveal math questions

nini4

还考到了fewer than and less than 得区别。
1.the number of people few than
b. less than

2. as many as de的用法

一个公司的男性占了总人口的25%， 销售人员占了总人口的50%。
问公司的人数。
a. 销售人员中游7 个是男的
b. 忘了

n=x^a y^b, 问世不是two 连续的奇数的乘积
a. a plus b is even
b. a mltiple b is even


a company bought a coat at whole sale price of 120 dollars. then sold it out at 20 percent off the retail price. the sold out price is the whole sale price's 40%, ask the retail price.