trigger updateEvent on ObjectB__c(after update) {

        Set<Id> objectAId = new Set<Id>();
        Set<Id> objectA2Id = new Set<Id>();
        Set<Id> ssfIds2 = new Set<Id>();
        Set<Id> objectDId = new Set<Id>();
        Decimal rollUp1 = 0;
        Decimal rollUp2 = 0;
        Decimal totalNumerator;
        Decimal totalDenominator;

        for(ObjectB__c b : Trigger.New) {
            objectAId.add(b.ObjectA__c);
        }

        List<ObjectC__c> objCList = [SELECT Id, Name, ObjectD__c, ObjectA__c, ObjectA__r.Name,
                                     ObjectA__r.StandardRollUp1__c, ObjectA__r.StandardRollUp2__c FROM
                                     ObjectC__c WHERE ObjectA__c IN: objectAId];

        for(ObjectC__c c : objCList) {
            objectA2Id.add(c.ObjectA__c);
        }

        for(ObjectC__c c : objCList) {
            objectDId.add(c.ObjectD__c);
        }

        List<Event> eList = [SELECT Id, Answer__c FROM Event WHERE ObjectD__c IN: objectDId];

        for(Event e : eList) {

            for(ObjectC__c c : objCList) {

                rollUp1 += c.ObjectA__r.StandardRollUp1__c;
                rollUp2 += c.ObjectA__r.StandardRollUp2__c;

                totalNumerator = rollUp1;
                totalDenominator = rollUp2;

                e.Answer__c = totalNumerator/totalDenominator;

            }


        }

        update eList;

}