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

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

If Rajina's daughter is my daughter's mom, who am I to Rajina?

I cannot talk, but I always reply when spoken to. What am I?

what does this below rebus represent identXQQQQQME

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?