What has hands, but can’t clap?

Can you replace the question mark with the correct number in the below table sequence?

What is the next number in this series?

4,12,84,3612....

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

You enter your friend's room. He is not in his room. Although you see that on the bed there are two dogs, five cats, two giraffes and three pigs. Also, a couple of chickens and ducks are flying in the room.

Calculate the number of legs standing on the floor.

The two towns are exactly 100 km apart. John leaves City A driving at 30 km/hr and Jacob leaves City B half an hour later driving at 60 km/hr. Who will be closer to City A when they meet?

Which English verb becomes past tense just by rearranging the letters?

A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

What has a ring but no finger?