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

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

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

The more of this there is, the less you see. What is it?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

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

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?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?