Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

Can you replace the question mark with the correct number in the below table sequence?

Can you find out the missing number in the grid?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

Find the number of squares in the below-given picture.

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

What is the centre of gravity?

You know three triplets: Frank John and Wayne (need to return your money). Frank always tells the truth while John and Wayne always lie. You meet one of them on the road and can ask him a three-word question.
Which question, will you ask?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

A mules travels the same distance daily.
I noticed that two of his legs travels 10km and the remaining two travels 12km.
Obviously two mules legs cannot be a 2km ahead of the other 2.

The mules is perfectly normal. So how come this be true ?