Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

Can it be possible to build a house that has all its four walls facing towards the South?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

In the picture given below, can you find out which digit will take place of the question mark?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

What do you see in the given picture?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

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

They are three errirs in this question. Can you find them?

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?