If 1 is added to each odd digit and 1 is subtracted from each even digit in the number 47523816, what will be the sum of the greatest and smallest digits in the new number formed?

If 1 is added to each odd digit and 2 is subtracted from each even digit in the number 7531468, how many digits will appear more than once in the new number thus formed?

If 1 is added to each odd digit and 2 is subtracted from each even digit in the number 5431786, what will be the difference between the highest and lowest digits in the new number thus formed?