Which is the correct shadow of the bird?

What does the below image rebus riddle means ?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

O_er_t_o_

Complete the missing letters of the given word.

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

Christina makes tasty toast in a small pan. After toasting one side of a slice, she turns it over. Each side takes 30 seconds. The pan can only hold two slices.
How can she toast both sides of three slices in 1 & 1/2 instead of 2 minutes?

A man comes across a coin that is dated 226 B.C. Can you calculate its worth?

A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?

Using exactly three matchsticks, can you divide the area into two equal parts?

How many words can a quill made with the feather of a pigeon write with a 100ml bottle of black ink?