HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 05 Question 18

HKIMO · HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 05

Question 18

The figure is built from 27 unit cubes. Find its total surface area.

1. 74
2. 76
3. 78
4. 80