Question
The volume of a cube is 729 cm 3 . If the cost
of painting the cube is Rs. 10 per cm 2 , 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 = x 3
ATQ;
729 = x 3
Or, x = 9
Area of five faces of the cube = 5x 2 = 5 × 9 × 9 = 405 cm 2
Required cost = 405 × 10 = Rs. 4,050
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