Forty-two young people are celebrating a party on the terrace. Not everyone knows each other, so at the time of saying goodbye, the first of the girls says goodbye with two kisses of 7 of the boys, the second says goodbye to 8 boys, the third of 9 and so on until the last girl , who says goodbye to all the kids at the party.
How many girls were at the party?
There are 6 more boys than girls. Total 18 women and 24 men.