You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

At my favorite fruit stand,
an orange costs 18,
a pineapple costs 27,
and a grape costs 15.
Using the same logic, can you tell how much a mango costs?

A convention is held where all the big logicians are summoned. The master places a band on everyone's forehead. Now all of them can see others bands but can't see his own. Then they are told that there are different colours of bands. All the logicians sit in circle and they are further explained that a bell will ring at regular intervals. The moment when a logician knew the colour of band on his forehead, he will leave at the next bell. If anyone leaves at the wrong bell, he will be disqualified.

The master assures the logicians that the puzzle will not be impossible for anyone of them. How will the logicians manage ?

Find the next number in the sequence

5 12 24 36 ?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

A doctor and a boy were fishing. The boy was the doctor’s son, but the doctor was not the boy’s father. Who was the doctor?