If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

How many triangles are there on the puzzle below?

What type of tree can I carry in my hand?

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

What is the relationship between these matchstick pictures below?

What is the next number in the series?

15 29 56 108 208 ?

What is the coolest letter in the alphabet?

A man was gazing through the window of the 23rd floor of the building. He suddenly opened the window and jumped on the other side of the window. On landing on the floor, there was not a sheer mark of injury on him.

How can that be possible if he did not use any kind of parachute and did not land on a soft surface?

What is common among 11, 69, and 88?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?