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Ethan is 40 years old his son is 12 years old. How many years was Ethan 5 times older then his son

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  1. Let that number of years be x
    Ethan --- 40+x
    son ------ 12+x

    40+x = 5(12+x)
    40+x = 60 + 5x
    -4x = 20
    x = -5

    it happened 5 years ago

    check: 5 yrs ago, Ethan was 35, son was 7
    and 35 is 5 times 7

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