Which is heavier: a ton of bricks or a ton of feathers?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

Move three sticks of the spiral below to form a square.

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

A large water tank has two inlet pipes (a large one and a small one) and one outlet pipe. It takes 3 hours to fill the tank with the large inlet pipe. On the other hand, it takes 6 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 9 hours.

What fraction of the tank (initially empty) will be filled in 0.64 hours if all three pipes are in operation? Give your answer to two decimal places (e.g., 0.25, 0.5, or 0.75).

No matter how little or how much you use me, you change me every month. What am I?

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

I am an odd number. Take away a letter and I become even. What number am I?

A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log.

Can you calculate the weight of the entire wooden log?

Spot what is wrong here in below Picture?