杭州交通信息网m5*40是螺钉长度40吗?:一道6年级英语题
来源：百度文库 编辑：杭州交通信息网 时间：2024/05/10 19:57:44
The lengths of two rivers are in the raito 12:7.The lenght of the longer one is 42km. Find the length of the shorter one.
12/7=42/X
X=24.5
Thus the length of the shorter one is 24.5