the ratio of father's age to his son age is 8:3. in 5 year's time the sum of their ages will be 54. how old are they

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  1. let their ages be 8x and 3x

    in 5 years:
    father's age = 8x+5
    son's age is 3x+5

    8x+5 + 3x+5 = 54

    solve for x, plug into my definitions

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  2. 8xplus 5 plus 3x plus 5 is equal to 54
    11x plus 10 is equal to 54
    11x is equal to 54-10
    11x is equal to 44
    Divide by 11 both side
    X is equal to 4

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