Jsck is twice as old as Jill,but in five years time he will only _英语解答

Jsck is twice as old as Jill,but in five years time he will only be one and
Jsck is twice as old as Jill,but in five years time he will only be one and a half times old as Jill.How old are Jack and Jill now/

人气：264 ℃　时间：2019-08-19 17:56:01

解答

Jsck应该是Jack吧
设Jack=x ,Jill=y
x=2y
x+5=1.5*(y+5)
解方程组
得X=10
Y=5
所以Jack现在10岁,Jill现在5岁.