Question 19
A cube has edge length 4 cm. Painting its edges requires 0.7 g of paint. The cube is cut into small cubes with edge length 1 cm. How many grams of paint are needed to paint all edges of all the small cubes?
Editorial note: This translation follows the explicit Vietnamese edge-painting wording; the parallel English source uses the ambiguous word “sides”. Treat the small cubes separately and use a constant paint amount per unit edge length.
Editorial note: This translation follows the explicit Vietnamese edge-painting wording; the parallel English source uses the ambiguous word “sides”. Treat the small cubes separately and use a constant paint amount per unit edge length.