Logic riddles

What starts with the letter "t", is filled with "t" and ends in "t"?

Answer

A teapot!

An egg can go through, but a bird can't. A tree can go through but a branch can't. A wall can go through but a window can't. What can pass through the green glass door?

Answer

Anything that has the same letter in a row can go through. Tree has 2 e 's egg has 2 g 's and wall has 2 l 's while all the other words don't have letters twice in a row.

A blue house is made of blue bricks. A yellow house is made of yellow bricks. A red house is made of red bricks. An orange house is made of orange bricks.
What would a green house be made of?

Answer

Glass.

Name me 3 keys you can't use?

Answer

A Monkey, A Donkey And A Turkey you Can't Stuff any of them into a Keyhole.

A man is alone and is carrying a bag as he approaches a grassy field he knows he is going to die.
How did the man die?

Answer

The man skydived off a plane and the bag he is carrying is a parachute that did not open.

A grandmother, an aunt, two mothers, two sisters, three daughters, a niece, and a granddaughter all went out to eat together. Everyone ate one ten dollar plate. If the grandmother and one of the mothers paid the entire bill, how much money did the grandmother have to pay?

Answer

Forty dollars. There were only four people and the grandmother, who was also one of the mothers, paid the entire bill.

You are locked in a room. No windows, no holes, nothing. All you have is a grand piano.
How do you get out?

Answer

You have to find the right keys! (Because pianos have keys)

You're in a room, with nothing in it except two robots. One robot always tells the truth, the other always lies. You don't know which is which.

There are two doors leading out of the room. One leads to certain death, the other leads to freedom. You don't know which is which.
You can ask either robot a question which will help you get out of the room. What is that question.
(Remember, you don't know which robot is which!)

Answer

You ask either of the robots "What would the other robot say if I asked it which is the door to freedom?"

If you as it this question, you will get the same answer from either robot. This is because the truth robot would want to tell you the truth, but because the other robot lies, it would have to lie too.
If you asked the liar robot this question, he knows that the other robot would tell the truth but he would lie.
So if you asked either robot that question, they would both point to the door to certain death.

How do you spell "we" with two letters without using the letters W and E?

Answer

U and I.

Mike was investigating a murder scene with his 2 police man. The suspects are Trish [her sister]. Dave [her partner] and Jordan [her dad]. Then Mike found a note with numbers and letters. It looks like this: t1 pip 515
After that Mike arrested the killer. Who did it?

Answer

Trish did it. When you put the messege upside down. It says "SIS did it." Trish is her sister.

10, 50, 13, 45, 18, 38, ?, ?
What two numbers should replace the question marks?

Answer

25, 27.

There are two alternate sequences: start at 10 and add 3, 5, 7; start at 50 and deduct 5, 7, 9.

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?

Answer

You can hang the iron rods on a string and watch which one turns to the north (or hang just one rod).
Another solution: take one rod and touch with its end the middle of the second rod. If they get closer, then you have a magnet in your hand