Question
The volume of a cube is 343 cm³. If the cost of painting
the cube is Rs. 9 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;
343 = x³
Or, x = 7
Area of five faces of the cube = 5x² = 5 × 7 × 7 = 245 cm²
Required cost = 245 × 9 = Rs. 2,205
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