The length of a room is 2 times it's breadth and 5 times of it's height. If the volume of the room is 800 m cube find the cost of papering it's wall at rs 6 per m cube

The length of a room is 2 times it's breadth and 5 times of it's height.If the volume of the room is 800 m cube find the cost of papering it's wall at rs 6 per m²

Rs. 1440

Step-by-step explanation:

Given that:

Breadth = b

Length = 2b

Height = 2b/5

Volume = b * 2b * 2b/5

Volume = 800 m³

800 = b * 2b * 2b/5

800 * 5 = 4b³

4000 = 4b³

4000/4 = 4b³/4

1000 = b³

10³ = b³

b = 10m

Length = 2 * 10 = 20m

Height = (2 * 10) / 5 = 4m

If plastering is at Rs. 6 per m²

Surface area:

2(lenght + breadth) height

2(20 + 10)4

2(30)4 = 240m²

Rs. 6 * 240 = Rs. 1440

56

step-by-step explanation: