Can you count the number of triangles in the picture below?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

Can you tell a 3D object that has just two surfaces?

I am white when I am dirty, and black when I am clean. What am I?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

Find out which of the given views in the picture is accurately the top view of the given pyramid.

What is both possible and impossible at the same time?

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?