You need to arrange three 7 and mathematical symbols to form number 1?

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.

Replace the question mark with the correct number.

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Rob is taller than Edwin, and Jurgen is shorter than Rob.
Of only one of the following statements, we now certainly know it is correct:

A.Edwin is taller than Jurgen
B.Jurgen is taller than Edwin
C.It cannot be determined if Jurgen or Edwin is the tallest.

Replace the question mark with the correct number below.

Whats the next number in the below number sequence pattern.

No one wants to have it, but if one got it, he does not want to lose it. What is It?

What does this rebus means ?

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