考试类型:Mathematics > Standard Multiple Choice
Read the following SAT test question and then click on a button to select your answer.
If the length and width of rectangle 
are 
percent less and 
percent less, respectively, than the length and width of rectangle 
, the area of 
is equal to what percent of the area of 
?
A. 
B. 
C. 
D. 
E. 
|
正确答案:A 解析: Let |
and 
represent the length and width, respectively, of rectangle 
. Then 
and 
represent the length and width, respectively, of rectangle 
. Simplifying 
and 
gives 
and 
for the length and width, respectively, of rectangle 
. The area of rectangle 
is 
. The area of rectangle 
is 
, or 
. Therefore, the area of rectangle 
is 
percent of the area of rectangle 
.
