SAT

长按二维码，轻松关注托福免费模考微信公众号

轻轻一按，托福水平早知道

轻轻一问，名师助你来备考

SAT备考经验SAT官方每日一题2011.7.21

SAT官方每日一题2011.7.21

信息来源：网络  发布时间:2011-07-22

2011年7月21日

考试类型:Mathematics > Standard Multiple Choice

 

Read the following SAT test question and then click on a button to select your answer. 

The length of rectangle S is twenty percent longer than the length of rectangle R, and the width of rectangle S is twenty percent shorter than the width of rectangle R. The area of rectangle S is

 

A.

B.

C. equal to the area of rectangle R

D. 4% less than the area of rectangle R

E.

 

 

 

 

正确答案:D

解析:

Represent the length and width of rectangle R as x and y. Then the area of R is x times y. The length of rectangle S is 20% longer than x, which is x = 0.20 times x, or 1.2 times x. Similarly, the width of S is y minus 0.20 times y, or 0.8 times y. The area of S is (1.2 times x) times (0.8 times y), which simplifies to 0.96 times x times y. From this it follows that the area of rectangle S is 4% less than t
分享到：

相关推荐

sat数学词汇大全

SAT数学真题9道

SAT2数学考试知识点

SAT考试

<%@ include file="cs.jsp" %> <%CS cs = new CS(1254562809);cs.setHttpServlet(request,response); String imgurl = cs.trackPageView();%>