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

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

If you paint a brown house white it will become a white house. If the stoplight changes from red to green, then the light is green. So, if you throw a white shirt into the Red Sea, what will it become?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

How many words can a quill made with the feather of a pigeon write with a 100ml bottle of black ink?

Solve the counting riddle by identifying the number of triangles in the given picture.

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?

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?