The volume of a closed cubical tank is 1331 cubic metre. Given that it costs Rs.10 to paint per square metre, find the cost incurred to paint its complete surface area from outside.
7260
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=Rs. 7260