What occurs twice in a week, once in a year but never in a day?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

How many bricks does it take to complete a building that is 15 feet wide, 30 feet deep, and 12 feet tall made of brick?

On a magical land of Mexico , all the animal in the land are rational.

There are 10 tigers and one goat.
Tiger can eat goat but since it's a magical land , the tiger who eats the goat , turns into goat and then can be eaten by the remaining tiger(s).

If we leave them for some time then how many goat and tiger will be there , when we come back ?

Spot what is wrong here in below Picture?

how come the second man dies?

You need to arrange three 7 and mathematical symbols to form number 1?

What can you catch but never throw?

I am the fastest animal but cannot climb the tree. What am I?

What is the last thing you take off before bed?