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?

John bought 150 chocolates but he misplaced some of them. His Father asked him how many chocolates were misplaced.
He gave the following answer to him:
If you count in pairs, one remains
If you count in threes, two remain
If you count in fours, three remain
If you count in fives, four remain
If you count in sixes, five remain
If you count in sevens, no chocolate remains.

Can you analyze the statements and tell us how many chocolates were lost?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

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?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?