A quarter is one-fourth of a dollar but Mr. John has changed the equation as below :

DOLLAR * 4 = QUARTER

Can you replace each letter with a digit to make the above solution correct?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

What has no start, end, or centre?

What can go up a chimney down, but can’t go down a chimney up?

Move three sticks of the spiral below to form a square.

Using mathematical symbols like +, -, and x in order to make the equations correct. Replace # with the above-given symbols.

9 # 8 # 7 # 6 # 5 # 4 = 91

Next Number in the Series,

5, 16, 49, 104, ?

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

If two's company, and three's a crowd, then whats four and five ?