What is the answer to 3 over 20 = y over x ? ?

 The equation is:  3x = 20y ; or, ↔ 20y = 3x ;
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             x = 20y / 3 ;
             
             y = 3x / 20 .

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;

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           3x = 20y is the equation;
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To solve for "y" in terms of "x"; 
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         20y = 3x ;
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  Divide EACH SIDE of the equation by "20" ; to isolate "y" on one side of the equation; and to solve for "y" in terms of "x" ;
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  20y / 20 = 3x / 20 ;
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               y = 3x / 20 ;
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To solve for "x" in terms of "y" ; 
_________________________________________________
    3x = 20y ;
__________________________________________________
  Divide EACH SIDE of the equation by "3" ; to isolate "x" on one side of the equation; and to solve for "x" in terms of "y" ;
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    3x / 3 = 20y / 3 ;
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              x  =  20y / 3 .
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