Can you find out the total number of triangles in the given figure?

What happened when the wheel was invented?

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

When 99 is considered higher than 100?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

The dirtier I get, the whiter I look. Who am I?

Two trains start at the same time, one from Bangalore to Mysore and the other from Mysore to Bangalore. if they arrive at their destinations one hour and four hours respectively after passing one another, how much faster is one train running than the other?

Can you find the company name in the pictogram below?

What does this rebus riddle means ?

Which number should replace the question mark?