Problem Solving
试题详情
题目：
Three-fourths of the area of a rectangular lawn 30 feet wide by 40 feet long is to be enclosed by a rectangular fence. If the enclosure has full width and reduced length rather than full length and reduced width, how much less fence will be needed?
选项:
A、
B、5
C、10
D、15
E、20
答案:
B
