Сейчас отцу 34 года, а сыну 11 лет. Через сколько лет возраст отца будет в 2 раза больше возраста сына?

СРОЧНО, помогите пожалуйста

ЗАДАНИЕ: Answer the questions using 'used to' and the worlds in brackets.
1) What dresses did your great-grand mother use to wear? ( long beautiful dresses)
2) What pies did she use to bake? ( with cabbage, rice, apples, fish)
3) Where did they use to go very often? ( zoo, circus, city parks)
4) Where did Celina use to live? ( New York)
5) Where did your friends use to spend their winter vacation? ( Rome)