There are three boxes which are labeled as Rs100, Rs150, and Rs200. One box contains two notes of Rs. 50. The second box contains one note of Rs50 and one note of Rs100 The third box contains two Rs. 100 notes. All boxes are labeled incorrectly.

What is the minimum number of boxes you must check in order to label all boxes correctly?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

Solve the mathematical equation in the picture below.

What is the last thing you take off before bed?

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

How can you make number one disappear by adding something to it?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

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