IKMC 2027 - Grades 7-8 - Self-study SET 12 - Thematic Batch 3 Question 23

Cubes are stacked into the tower shown. Each cube has dimensions 2 × 2 × 2, 4 × 4 × 4 or 6 × 6 × 6. Tik wants to build an identical tower entirely from 1 × 1 × 1 cubes. How many unit cubes are needed?