关闭

澳际学费在线支付平台

SAT官方每日一题 2017年5月16日.

刚刚更新 编辑: 浏览次数:180 移动端

SAT试题类型 Mathematics > Standard Multiple Choice Read the following SAT test question and then click on a button to select your answer. The length of a rectangle is increased by 20%, and the width of the rectangle is increased by 30%. By what percentage will the area of the rectangle be increased? (A) 25% (B) 36% (C) 50% (D) 56% (E) 60% 答案:D 解析:

Let and be the original length and width of the rectangle, respectively. If we denote by and the new length and width of the rectangle, respectively, then we have:

and

So, the new area will be:

where () is the original area of the rectangle. So the area is increased by .

  • 澳际QQ群:610247479
  • 澳际QQ群:445186879
  • 澳际QQ群:414525537