A square-based tank of capacity 250 cu m has to bedug out. The cost of land is Rs 50 per sq m. The cost of digging increases with the depth and for the whole tank the cost is Rs `400 xx (depth)^2`. Find the dimensions of the tank for the least total cost.

A square tank of capacity 250 m^3 has to be dug out. The cost of land is Rs. 50 per m^2 . The cost of digging increases with the depth and for the whole tank it is Rs. 400 times(depth)^2 . Find the dimension of the tank when the total cost is least.

A square tank of capacity 250 m^3 has to be dug out. The cost of land is Rs. 50 per m^2 . The cost of digging increases with the depth and the whole tank is Rs. 400 times(depth)^2 . Find the expression for the cost of digging the tank.

The length of a room is 3 times its height and breadth is 1(1)/(2) times its height.The cost of whitewashing the walls at the rate of Rs. 71.50 per sq.m is Rs.216. Find the dimensions of the room.

The cost of flooring at Rs. 25 per sq. m is Rs. 750. If the length of the room is 6 m. Find the breadth of the room.

What will be the cost of digging a well of radius 3m and depth 7m at the rate Rs 30 per cubic metre ?.

The height of a conical tank is 60 cm and the diameter of its base is 64 cm. The cost of painting it from outside at the rate of Rs35 per sq m is

The cost of 30 mangoes is less then cost of 40 mangoes by Rs 50. Find the cost of 50 mangoes in (Rs) (a)400 (b) 300 (c)250 (d) 350

A closed box (cuboid) with a square base is to have a volume 2000c.c, The material for the top and bottom of the box is to cost Rs 3 per square cm and the material for the sides is to cost Rs 1.50 per square cm. If the cost of the material is to be least find the dimension of the box.

A metal box with a square base and vertical sides is to contain 1024 cm3 of water, the material for the top and bottom costs Rs 5 per cm2 and the material for the sides costs Rs 2.50 per cm2. Find the least cost of the box.