神马品牌网梦幻西游 鬼将动图:一道6年级英语题
来源：百度文库 编辑：神马品牌网 时间：2024/05/15 03:11:48
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