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

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

Okay before we begin with the puzzle, do keep in mind that you have to answer it quickly.

You are participating in a car race. Seeking the perfect moment, you overtake the second person in the race. What positions are you in now?

What does this Rebus Picture means ?

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?

A boy collects white seashells from the sea and brings them home every night. When he has enough of them, he decides to sell them to a trader.

The trader is ready to buy the shells and he asks the boy about the quantity. At this, the boy starts calculating. He has a giant box that contains 3 mini boxes. Two of them have another mini box inside. If the giant box can hold 50 shells, how many brown shells can he sell to the trader?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

What does the below rebus puzzle mean?