Cecilia-You see that each group is different and you said they are already added up so let's see.Symbols: V=volleyball S=softball B=basketball N=nothingIt's easy to do this downwards.V -33S -34B -39N -12Then we see the groups.V&S -20V&B -10S&B -8So we subtract them from each group.V- 33-20=12-10=3S- 34-20=14-8=6B- 39-10=29-8=21Let's add them up but don't forget the people hat don't like anything!And add the second number of every place. So....20+10+8+12+3+6+21=78But remember, don't add the same numbers. Like 10 and 10 because they are already groups. And your answer is 78!! Well there ya go.Hope this helps!