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a boy is 17 years old and his sister is as twice as old. when the boy is 23 what will be the age of his sister

  • math -

    When he was 17 her sister was 34 so when he is 23 which is 6 years later her sister would be 34+6 which is 40 years old

  • math -

    17 * 2 = 34 >> present age of sister

    23 - 17 = 6 >> years from now

    6 + 34 = ?

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