Jack is 15 years old,three times as old as his sister.How ol

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Jack is 15 years old,three times as old as his sister.How old will Jack and his sister be when he is twice as old as his sister?

Jack is 15 years old, three times as old as his sister.
So his sister is 5 years old.
How old will Jack and his sister be when he is twice as old as his sister?
Jack will be 20 years old and his sister 10 years old.

Jack is 15 years old,three times as old as his sister.How ol 进、?1 Jane is four years old.Her brother is three times as ol three times as old as his Mnm is five times as old as my sister.How old is mum now? Mum is times as old as my sister.How old is mum now?________ 智力测试 Jack is 15 years older than his sister.How old will ... In 15 years she will be twice as old as her son.How old is s in another three years Tom will be three times as old as he my grandma is 84.she is four times as old as am .how old am Jack is twice as old as Jill, Ben is as old as your sister How old is your ( ) sister?She is 17 years old.She is three