what's the probability of getting a king or a queen from a pack of 52 cards?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

If eleven plus two equals one, what does nine plus five equal?

On one occasion, A Boy collects 71 rupees in form of 20 paise and 25 paise. He collects a total of 324 coins.

Can you tell me how many 20-paisa and 25-paisa he got?

What is the riddle which can be asked all day with a different correct answer each time.

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?

I add 5 to 9 and get 2. The answer is correct, so what am I?

Two trains start at the same time, one from Bangalore to Mysore and the other from Mysore to Bangalore. if they arrive at their destinations one hour and four hours respectively after passing one another, how much faster is one train running than the other?

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?