Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

John and his team plan to rob a safe. They got just one chance to break the code else the local police will be informed. Below are clues:
A) Exactly one number is perfectly placed: 9 8 1
B) Everything is incorrect: 9 2 4
C) Two numbers are part of the code of the safe but are wrongly placed: 0 9 3
D) One number is part of the code of the safe but is wrongly placed: 1 4 7
E) One number is part of the code of the safe but is wrongly placed: 7 8 3

If it took eight men ten hours to build a wall, how long would it take four men to build it?

What does this mean?

CCCCCCC

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?