Can you find the odd number in the following?

2716, 4135, 5321 and 7145

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

There is something which is always coming but never arrives?

What is the fastest way to double your money?

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

You have a square. What you have to do is cut and reassemble the square such that you create a Red Cross sign that has the same volume as that of the square.

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

Find the value of "?" in the ball picture Riddle below:

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

Prove that the below maths equation is true.

8 + 8 = 91