You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

A farmer went to a market and bought a wolf, a goat, and a cabbage. On his way home, the farmer came to the bank of a river and rented a boat. But crossing the river by boat, the farmer could carry only himself and a single one of his purchases: the wolf, the goat, or the cabbage. If left unattended together, the wolf would eat the goat, or the goat would eat the cabbage. The farmer’s challenge was to carry himself and his purchases to the far bank of the river, leaving each purchase intact. How did he do it?

Can you count the number of blocks in the picture below?

Rearrange the letters in "new door" to make one word.

If,

A = 1

B = 2

C = 3

...

...

Z = 26.

Based on above rule, you need to find an eleven letter word whose letter sum is equal to 52.

What does an Island and the letter T have in common?

Name a key which is hardest to turn.

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?