Question
The volume of a cube is 4096 cm³. If the cost of
painting the cube is Rs. 4 per cm², then find the cost of painting five faces of the cube.Solution
Let the length of the edge of the cube be ‘x’ cm.
Volume of cube = x³
ATQ;
4096 = x³
Or, x = 16
Area of five faces of the cube = 5x² = 5 × 16 × 16 = 1280 cm²
Required cost = 1280 × 4 = Rs. 5,120
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