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18 July, 22:29

Abby is half as old as her dad and as twice as old as her brother. if her brother is 9 years old how old is her dad?

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  1. 19 July, 02:23
    0
    A=D/2

    A=2B

    B=9

    A=2 (9)

    A=18

    18=D/2

    *2 both sides

    D=36
  2. 19 July, 02:26
    0
    Let Abby's father's age be x.

    Then Abby's age = 1/2 x or her father's age = 2 * Abby's age

    Abby's brother's age = 9 years

    So, Abby's age = 2*9 = 18 years

    ∴ her father's age = 2*18 = 36 years
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