I’m tall when I’m young, and I’m short when I’m old. What am I?

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?

How many triangles can you count in the figure given?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

A landlord calls both of his sons and tells them that their horses will now decide who will transfer the inheritance. He tells them to race along the land till the end and the one whose horse will be slower will win and be the heir to all the property.

Both of them keep wandering for days but to no result. Then they ask a wise man regarding it. The man advises them on the matter after which they jump on the horses and race as fast as they can till the end. Why did they do it?

What did the wise man say?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

What can go up a chimney down, but can’t go down a chimney up?

In one of the popular batman series movie "Batman Forever", there was a riddle that goes like "Tear me off and then scratch my head and I was red then and now I am back. Who am I?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?