If 3 is added to each odd digit and 2

Step 1: Apply the rules to each digit

Rules:

Odd digit → add 3

Even digit → subtract 2

Digits: 5, 3, 4, 1, 2, 5, 6

5 (odd) → 5 + 3 = 8

3 (odd) → 3 + 3 = 6

4 (even) → 4 − 2 = 2

1 (odd) → 1 + 3 = 4

2 (even) → 2 − 2 = 0

5 (odd) → 5 + 3 = 8

6 (even) → 6 − 2 = 4

Step 2: New number formed

New digits: 8, 6, 2, 4, 0, 8, 4

Step 3: Find the highest and lowest digits

• Highest digit: 8

• Lowest digit: 0

Difference: 8 − 0 = 8