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 ‘a’ cm. ATQ; a3 = 64 Or, a = 4 Area of four faces of the cube = 4 × 42 = 64 cm2 Required cost of painting = 64 × 20 = Rs. 1280
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Match List – I with List – II and select the correct answer using the codes given below the lists:
Direct change of gas to solid without changing in to liquid is called _________.
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