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

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

You are given four tennis balls and asked to arrange those balls in a manner that the distance between each one of them is exactly equal. How will you do it?

I’m tall when I’m young, and I’m short when I’m old. What am I?

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?

After teaching his class all about Roman numerals (X = 10, IX=9 and so on) the teacher asked his class to draw a single continuous line and turn IX into 6. The teacher's only stipulation was that the pen could not be lifted from the paper until the line was complete.

Find the hidden panda in the image below.

The more you take me, the more you leave me behind.
Who Am I?

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

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?