what does this picture(rebus) riddle means ?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

What's a single-digit number with no value?

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

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

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

In the figure that has been attached to this question, each digit represents a digit. The similar letters carry the same integer value. Can you expose the original digits?

We are a group of eight brothers. We consider the weak, yet we protect the king in every battle. If we move ahead, we never turn back. Who are we?

Find the next number in the following series:
6, 14, 26, 98, __?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?