Math

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Dominic was 8 years old when his sister was born. Now the sum of their ages i 56. How old is Dominic now?

  • Math -

    from the first statement, it implies that Dominic is 8 years older than his sister.
    first we represent unknowns using variables:
    let x = sister's age
    let x+8 = Dominic's age
    since the sum of their ages is 56,
    x + (x + 8) = 56
    then we solve for x:
    2x + 8 = 56
    2x = 48
    x = 24 (sister's age)
    x+8 = 32 (Dominic's age)

    hope this helps~ :)

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