Mathematics, 29.10.2021 14:00 dcox5057
billy is $\frac 15$ of his brother's age. in $9$ years, billy will be $\frac 12$ of his brother's age. what is the sum of their current ages, in years?
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billy is $\frac 15$ of his brother's age. in $9$ years, billy will be $\frac 12$ of his brother's ag...
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