What is the fastest way to double your money?

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?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

Aman has 1.15 rupees in his pocket. There are a total of 6 coins in his pocket.

When his friend asked him for a change, he could not give change for a rupee and five paisa.

Can you tell which coins he has?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

You can see three almost identical images below. Can you spot the odd one out from them?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

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

Can you place three balls such that the equation shown in the picture holds true?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.