100+ Brain teasers with answers for kids and adults

Guess the next three letters in the series GTNTL.

A monkey, a squirrel, and a bird are racing to the top of a coconut tree. Who will get the banana first: the monkey, the squirrel, or the bird?

A sundial has the fewest moving parts of any timepiece. Which has the most?

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

He has married many women but has never been married. Who is he?

I have a large money box, 10 inches wide and 5 inches tall, Roughly how many coins can I place until my money box is no longer empty?

What is made of water but if you put it into water it will die?

An elevator is on the ground floor. There are four people in the elevator, including me. When the elevator reaches the first floor, one person gets out and three people get in. The elevator goes up to the second floor. Two people get out and six people get in. It then goes to the next floor up. No one gets out, but 12 people get in. Halfway up to the next floor, the cable snaps, and the elevator crashes to the floor. Everyone else dies in the lift. How did I survive? 

A red house is made from red bricks. A blue house is made from blue bricks. A yellow house is made from yellow bricks. What is a greenhouse made from? 

What can be driven although it doesn't have wheels, sliced but stays whole?

What is harder to catch the faster you run?

Which creature walks on four legs in the morning, two in the afternoon, and three in the evening?

A family has two parents and six sons. Each of the sons has one sister. How many people are in the family? 

Brothers and sisters I have none but this man's father is my father's son. Who is the man?

Who makes it, does not need for it. Who buys it, has no use for it. Those who use it can neither see nor feel it. What is it?