What four weights can be used to balance from 1 to 30 pounds?

Which letter of the alphabet has the most water?

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

In Greek mythology, the Sphinx sat outside of Thebes and asked this riddle of all travellers who passed by. If the traveller failed to solve the riddle, then the Sphinx killed him/her. And if the traveller answered the riddle correctly, then the Sphinx would destroy herself. The riddle:

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Oedipus solved the riddle, and the Sphinx destroyed herself.

What is the centre of gravity?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

What is the largest number you can write with just 3 digits?

There is a square piece of paper with a hole that is denoted by the circle on the top right side in the given picture. You have to cut the paper in a manner that it forms two and only two separate pieces of paper and then rearrange the pieces in a manner that the holes come in the centre of the paper.