How can you write nineteen in a manner that if we take out one, it becomes twenty?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

Can you name an animal whose killing cannot be performed without spilling your own blood?

An inspection by the superintendent of St. Joseph School was scheduled on the next day. The class teacher Jenifer knew that he would be asking questions from her class and she would have to choose a pupil to answer. To offer a perfect impression over him, the teacher explained certain instructions to the students to maximise the chances of getting correct answer every time.

What did she say to the students?

Prove that twice of ten is the same as twice of eleven.

Which letter of the alphabet has the most water?

If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?

Count the number of lines in the image below ?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

What is common among 11, 69, and 88?