How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

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

Explain?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Count the number of balls in picture below:

A boy purchased a book from a bookkeeper and gave him $100.
The cost of the book is $50 but the bookkeeper has no change, so he gets the change from the next shop and returns the boy his $50.

After some time the next shopkeeper came with the $100 note and told the bookkeeper that the note was a fraud, so he took the money back.

How much loss did the bookkeeper face?

What is red and smells like blue paint?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?