What is the fastest way to double your money?

Solve the mathematical equation in the picture below.

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

What English word has three consecutive double letters?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

Whats the next number in the below number sequence pattern.

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?

I welcome the day with a show of light, I stealthily came here in the night. I bathe the earthy stuff at dawn, But by noon, alas! I'm gone.