Each of the digits in the number 2846359 is arranged in ascending order from left to right. The position of how many digits will remain unchanged as compared to that in the original number?

If 2 is added to each odd digit and 1 is subtracted from each even digit in the number 7852163, what will be the difference between the highest and lowest digits in the number thus formed?

This question is based on the five, three-digit numbers given below. (Left) 687 652 691 287 286 (Right) (Example: 697 - First digit = 6, second digit = 9 and third digit = 7) (NOTE: All operations to be done from left to right.) What will be the resultant if the second digit of the highest number is added to the third digit of the lowest number?