In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat.

Can this even be possible?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

By moving just one matchstick, you need to make the below statement true. Can you do it?

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?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

Can you count the number of matches in the picture below ?

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

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

What can you hold in your right hand, but never in your left hand?