IKMC 2027 - Grades 5-6 - Self-study SET 17 - Thematic Batch 3 Question 7

Bin needs 9 kg of paint to cover all exterior faces of the solid 3 × 3 × 3 cube. How much paint is needed for the white interior faces of the cut-out cube?



The source’s left/right references are reversed; identify the solid and cut-out cubes by their drawings.