Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

A boy collects white seashells from the sea and brings them home every night. When he has enough of them, he decides to sell them to a trader.

The trader is ready to buy the shells and he asks the boy about the quantity. At this, the boy starts calculating. He has a giant box that contains 3 mini boxes. Two of them have another mini box inside. If the giant box can hold 50 shells, how many brown shells can he sell to the trader?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

If two fifty-foot ropes are suspended from a forty-foot ceiling that is twenty feet apart, how much rope will you be able to steal if you have a knife?

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

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

Why did Buffon take the goal with him after every Juventus match?

Can you count the number of blocks in the picture below?

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?