Each odd digit in the number '95435478162' is substituted by its previous lower digit and each even digit is substituted by its next higher digit. The digits so obtained are then rearranged in descending order from the left end. What is the sum of the seventh digit from the right end and the fourth digit from the left end after the rearrangement?

Each of the digits in the number 5423768 is arranged in ascending order from left to right. The position of how many digits will remain unchanged compared with that in the original number?

Each of the digits in the number 5312768 is arranged in ascending order from left to right. What will be the sum of the digits that are second from the left and second from the right in the new number thus formed?