The more you take me, the more you leave me behind.
Who Am I?

What goes up but never comes down?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

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?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

Imagine a box with two cogwheels, one big with 24 teeth and one small with 8 teeth. The big one is firmly attached to the center of the box which means it does not turn or move while the small one rotates around the big one.

How many times do you think that the smaller wheel will turn compared to the box when it turns once around the big one?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?