A metallic cylinder of height 14 cm and radius 6 cm is

Solution

Volume of cylinder = πr²h {Where 'r' is radius and 'h' is height} Volume of cuboid = l x b x h {Where 'I', 'b' and 'h' are; length, breadth and height of the cuboid} So, total volume of the cylinder = (22/7) x 6² x 14 = 1584 cm³ And total volume of a cuboid = 3 x 2 x 1 = 6 cm³ So, total number of cuboids made = 1584 ÷ 6 = 264 Total surface area of cuboid = 2 x (lb + bh + lb) = 2 x {(3 x 1) + (3 x 2) + (2 x 1)} = 2 x 11 = 22 cm² So, total surface area of all cuboids = 22 x 264 = 5808 cm² And total surface area of the cylinder = 2πrh = 2 x (22/7) x 6 x 14 = 528 cm² We can see that total area of all the cuboids together is (5808/528) = 11 times the area of the cylinder So, cost of painting the cuboids will be 11 times the cost of painting the cylinder = Rs. '11P'