If 3 is added to each odd digit and 1 is subtracted from each even digit in the number 42524563, what will be difference between the highest and lowest digits thus formed?

Original number: 42524563

Formula Used:
To get the difference between the highest and lowest modified digits:

Difference = Maximum digit − Minimum digit

Solution:
According to the question;

4 (even) → 4 – 1 = 3

2 (even) → 2 – 1 = 1

5 (odd) → 5 + 3 = 8

2 (even) → 2 – 1 = 1

4 (even) → 4 – 1 = 3

5 (odd) → 5 + 3 = 8

6 (even) → 6 – 1 = 5

3 (odd) → 3 + 3 = 6

Modified number: 31831856

Maximum digit: 8

Minimum digit: 1

Difference = 8 – 1 = 7
Thus, the difference between the highest and lowest digits is 7.