What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

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

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

A car is crossing a 20 km-long bridge. The bridge can support at most 1500kg of weight over it. If somehow, the weight on the bridge becomes more than that, it will break.

Now, the weight of the car is exactly 1500kg. At the midway, a bird comes and sits on the roof of the car. This bird weighs exactly 200 grams.
Can you tell if the bridge breaks at this point or not?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

There is a number which when you multiply by 3 and subtract 2 from the result, then the resulting number is the reverse of the actual number.

What is the smallest number that stands true on the statement?

What does man love more than life, and hate more than death or mortal strife; that which satisfied men want; the poor have, and the rich require; the miser spends, the spendthrift saves, and all men carry to their graves?

In a town, there are four houses located at different distances from each other. Following are the distances:

The third house is 60 meters apart from the first house.
The fourth house is 40 meters apart from the second house.
The third house is 10 meters nearer to the fourth house than it is to the second house.

Can you find out the distance between the fourth and the first house?

Buy me, smell me or deliver me, I do not change.

Who am I?