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Math Help - ratios

  1. #1
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    ratios

    please help me find the ratio of x to y
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by sanee66 View Post
    please help me find the ratio of x to y
    AB : DE = 5 : 4

    \Rightarrow \frac {AB}{DE} = \frac {5}{4}

    \Rightarrow \frac {x + 16}{16} = \frac {5}{4}

    \Rightarrow \boxed { x = 4 }


    AC : DF = 5 : 4

    \Rightarrow \frac {AC}{DF} = \frac {5}{4}

    \Rightarrow \frac {y + 7}{20} = \frac {5}{4}

    \Rightarrow \boxed { y = 18 }


    Thus we have x : y = \frac {x}{y} = \frac {4}{18} = \frac {2}{9} = \boxed { 2 : 9 }
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