How do you go from 98 to 720 using just one letter?

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?

What is next number in the pattern below:

131 517 192 123 ?

Can you solve this picture maths equation?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

A girl was standing near the window thinking something. All of a sudden she decides something and throws something out of the window. She dies very soon after throwing it. She was perfectly healthy and had no disease or allergy. No one killed her and she did not commit suicide.

Can you think of any possible explanation that is logical as well for what happened there?

They are three errirs in this question. Can you find them?

what does this picture(rebus) riddle means ?

Find the next number in the series.
1 10 24 43 67 ?

I travel all around the world but always stay in the corner. What am I?