IKMC 2027 - Grades 5-6 - Self-study SET 5 - Thematic Batch 3 Question 11

Jenny has a solid cube made from 125 unit cubes. She removes some cubes to make the holes shown. How many unit cubes remain?



Editorial interpretation: The three pictured 1×3 openings are straight tunnels all the way through the cube, with constant cross-sections.