Mark realizes that a lot of the friends on his friends list are people he doesn't talk to anymore.  He keeps 40% of his friends list and then contacts the rest.  Of those only 50% respond.  He removes everyone who did not respond.  If he had 100 friends how many does he have left after the removal?
He contacted 1-.4=<<1-.4=.6>>.6 of his friends
So he contacted 100*.6=<<100*.6=60>>60 people
So he removes 60/2=<<60/2=30>>30 people
So he has 100-30=<<100-30=70>>70 friends left
#### 70