Question
The volume of a cube is 64 cm3. If the cost of painting is Rs. 20/cm2 , then find the cost of painting the four faces of the cube.
Solution
Let the length of edge of the cube be βaβ cm. ATQ; a3 = 64 Or, a = 4 Area of four faces of the cube = 4 Γ 42 = 64 cm2 Required cost of painting = 64 Γ 20 = Rs. 1280
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