Round the answer to 1 decimal digit.
a/6 = 5/7

The answer is:  a = 4.3  . 

Explanation:

Given:

    a/6 = 5/7 ; Solve for "a" ;


    7a = 5*6 ;

    7a = 30 ;

Divide EACH side of the equation by "7" ; to isolate "a" on one side of the equation; and to solve for "a" ;

 7a / 7 = 30 / 7 ; 

     a = 30 / 7 = 4.2857142857142857 ; 
        
                 → round to 1 decimal digit ; 
 
                 → The first 2 decimal digits are: 4.28 ;
                           Since the 2nd decimal digit is "8" (i.e., "5" or greater), 
                        we round the first decimal digit to the higher number;

                 →  The answer is:  a = 4.3  .

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