进、?1 Jane is four years old.Her brother is three times as old as Jane..How old will Mark be when he is twice as old as Jane?
问题描述：
进、?1 Jane is four years old.Her brother is three times as old as Jane..
How old will Mark be when he is twice as old as Jane?
答
Jane's father is 3.2 times as old as Jane. While her mother is 2.6 times as old as Jane As is known that her father is 9 years older than her mother,how old is Jane
答
twelve
eight
答
4 / 12
4+4 / 12+4
Mark will be sixteen when he is twice as old as Jane