This circular puzzle looks random at first, but it follows a clear pattern based on the center number, 5.
Each pair of opposite numbers is linked by multiplying by 5:
2 × 5 = 10, 3 × 5 = 15, 4 × 5 = 20.
Following the same rule, 5 × 5 = 25, so the number opposite 5 must be 25.
Answer: 25