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?

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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?
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?

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?
4 / 12
4+4 / 12+4
Mark will be sixteen when he is twice as old as Jane

twelve
eight

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