The goals against average (a) for a professional hockey goalie is determined using the formula a = 60 a equals 60 left-parenthesis startfraction g over t endfraction right-parenthesis.. in the formula, g represents the number of goals scored against the goalie and t represents the time played, in minutes. which is an equivalent equation solved for g? startfraction a t over 60 endfraction equals g.= g startfraction a over 60 t endfraction equals g. = g startfraction 60 a over t endfraction equals g. = g 60at = g