If you count 21 letters in the English alphabet from the end and 20 letters from the beginning, which letter will appear exactly in the middle of the sequence formed by these two letters?

All the individual letters in the word PICKLED are arranged in alphabetical order. How many letters are there in the English alphabetical order between the letter which is second from the left and the one which is fourth from the right in the new letter cluster thus formed?

The position(s) of how many letters will remain unchanged if each letter in the word EDUCATORS is arranged in English alphabetical order?