The volume of a closed cubical tank is 1331 cubic metres. Find the cost of painting its complete surface area from outside at the rate of ₹ 10 per square meter.
Let the side of the given cubical tank be 'a' metres .
Volume of the given cube is a×a×a
By prime factorization, we get cube root of 1331 as 11
Surface area of each side of a cube is a×a
Total surface area of the cube is 6×a×a
Cost incurred is then 10×6×11×11 = ₹ 7260