To find the number of people who prefer hiking but not in the mountains, we need to consider the preferences for hiking at the seaside and on the island.
From the table:
- Hiking at the seaside: 20
- Hiking on the island: 12
Now, we add these two numbers together:
20 (seaside) + 12 (island) = 32
Therefore, the number of people who prefer hiking but not in the mountains is 32.