If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

What has many keys but can’t open a single lock?

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

I am the fastest animal but cannot climb the tree. What am I?

A sundial has the fewest moving parts of any timepiece. Which has the most?

I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and the cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket?