What occurs twice in a week, once in a year but never in a day?

Can you find the 09 errors in the picture below?

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

You along with your friend are standing in front of two houses. Each of those houses inhabits a family with two children.

Your friend tells you the below two facts:
1) On your left is a family that has a boy who likes accounts but the other child loves science.
2) On the right is a family with a seven-year-old boy and a newborn baby.

You ask him, "Does either of the family have a girl?"

To this, he replies, "I am not quite sure. But can you guess that? If you are right, I will give you $500."

Which family do you think is likely to have a girl?

How many bananas can you eat if your stomach is empty?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

What is the next number in this matchsticks series riddle?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

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?

Can you name some countries which do not have the alphabet 'A' in them?