Can you find out the missing number in the grid?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

What is the next number in the series?

15 29 56 108 208 ?

Complete the table series riddle by finding the number that can replace "??".

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

Find out the missing number in the picture attached:

What is the longest word in the dictionary?

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.

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?