If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

A quarter is one-fourth of a dollar but Mr. John has changed the equation as below :

DOLLAR * 4 = QUARTER

Can you replace each letter with a digit to make the above solution correct?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

I don't get anymore wetter, no matter how much rain falls on me.

What number divided by 4 is the same as that number minus 4?

Can you start the fire using two pieces of wood?

An inspection by the superintendent of St. Joseph School was scheduled on the next day. The class teacher Jenifer knew that he would be asking questions from her class and she would have to choose a pupil to answer. To offer a perfect impression over him, the teacher explained certain instructions to the students to maximise the chances of getting correct answer every time.

What did she say to the students?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Two fathers and two sons went fishing one day. They were there the whole day and only caught 3 fish. One father said, that is enough for all of us, we will have one each. How can this be possible?

I inserted a coin in a bottle and closed its mouth with the help of a cork. Now, I was able to take the coin out from the bottle without taking out the cork or breaking the bottle. Can you tell me how I did it?