This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

If 1+9+8=1, what is 2+8+9?

Can you make a six-letter word using the letters N, A and B ?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

In the image below, can you find the value of an angle(y)

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

Three people check into a hotel. They pay $60 for the rent of the room. After they check-in, the manager realize that the rent for the room is $55. So, he gives $5 to the bellboy and asks him to give it to them. The bellboy thinks that it will be difficult for the three people to share $5 among them and seeking the personal benefit, he pockets $2 and gives the remaining $3 to them.

Now, each person paid $20 and got back $1. In this manner, each of them paid just $19 which totals to the amount of $57. The bellboy has $2 with him and adding them, we get $59. So where is the remaining $1?