Can you place six X (crosses) in below board without making three in a row in any way ?

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

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?

What does the below rebus riddle means?

Spot 5 differences in two Christmas tree below:

Which wheel of car does not rotate when you turn your car right?

What does the below rebus puzzle mean?

Why did Navjot Singh Sidhu put the new January calendar in the freezer

You have a 12 liters jug full of water. You have two empty 8 liters and 5 liters jug. How can you divide the water into two equal parts using these jugs?

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?