The mean of 4 test scores is 90 what is the sum of the scores

The answer is:  " 360 ".  

   {The sum of the scores is:  "360" .}.

Explanation:

The mean is calculated by:  [the sum total of values];
       divided by the number of values. 

We want to find:  "[the sum total of values]";

Given:    1)  The mean is:  90.
               2)   The number of values is:  4.


So, [the sum total of values]; divided by 4; equals 90 ;

   → Write as: " [the sum total of values] ÷ 4 = 90 " ; 

   →  Multiply EACH side of this "equation" by "4" ;  
       to solve for the "[sum total of values]" ;

   →  [the sum total of values] ÷ 4 * 4 = 90 * 4 ;

to get:    

   →  [the sum total of values] =  90 *  4  =  360  .

       The answer is:  " 360 ".  The sum of the scores is:  " 360 " .