What is black when you buy it, red when you use it, and gray when you throw it away?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

My location can be determined by the below rebus.
So where am i ?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

Five thieves looted a bank and they ran away in a car. The bank staff informed the police and they began the search of their car in their jeep. They found them on a road and chased them eventually catching them. The light that is used to fill the number plate was broken on the thieves' car. Also, the headlights of the jeep police were not working. How were the police able to catch the thieves then?

Why is it very easy to weigh a fish?

What is next number in the pattern below:

131 517 192 123 ?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

In a football game, Christina defeated Teresa by 2 - 0 but no man from either side scored. How can this be possible?

A Child was born in Lahore, Pakistan. Still, the child is not a Pakistani citizen. why?