Good Riddles

Question: If 4+5=24 7+2=21 9+6=63 6+7=?

Question: You can play me and pull me,
I love the naive.
I'm enjoyable to give,
but bad to receive.

What am I?

Question: There was a man who sleeps from 10:00 p.m to 5:00 a.m. He never wakes up between his sleeping time. During 12:00 midnight, he found himself in his neighbor's house. His neighbor is sleeping. He secretly stole his precious frame. Then, it was 5:00 a.m. He woke up and by 7:30 a.m he visited his neighbor's house. There he sees his neighbor's precious frame. He thought he stole it. How is this possible?

Question: A smart landscaper is given the task of placing 4 trees so that they are all the same distant away from each other.

How does he do this?

Question: Flies hate us with a passion, who are we?