Mark keeps 40% of his friends list, which is 40/100 * 100 = 40 friends.
He contacts the remaining 60% of his friends list, which is 60/100 * 100 = 60 friends.
Of those 60 friends, only 50% respond, which is 50/100 * 60 = 30 friends.
Mark removes everyone who did not respond, so he is left with 40 friends + 30 friends = 70 friends.
#### 70
The answer is: 70
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
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?

### Answer:
