Why 1729 is a magic number? Answer Logically.

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

When monkey rotate the gear, which mark will be hit 1 or 2 ?

Who is that with a neck and no head, two arms and no hands? What is it?

I have branches, but no fruit, trunk or leaves. What am I?

Sally lives in a place where six months of the year is mild summer and the temperature drops significantly the other six months. She owns a lake where there is a small island. She wants to build a house on the island and needs to get materials there. She doesn’t have a boat, plane, or anything to transport them to the island. How does Sally solve this problem?

A deaf and mute man goes to the train station. Tickets for the train are 50 cents each. The man goes to the ticket booth and hands the man inside just a dollar. The man in the booth hands him two tickets.

How did the man in the booth know to give him two tickets without even looking at him?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

A boy purchased a book from a bookkeeper and gave him $100.
The cost of the book is $50 but the bookkeeper has no change, so he gets the change from the next shop and returns the boy his $50.

After some time the next shopkeeper came with the $100 note and told the bookkeeper that the note was a fraud, so he took the money back.

How much loss did the bookkeeper face?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211