Question

an iron tank 20m long,10m wide,and 8 m deep is to be made from iron sheet 4m wide if the tank is open from top find the cost of the iron sheet at the rate of 5r​

Answer 1

Answer:

length = 20 m.

Breadth = 10 m  

height= 8 m.

Surface Area of the tank = 2[ bh + hl]  + lb

= 2[10×8+8×20] + 10*20

= 2×240 + 200 m^2

=680m^2

Area of the rectangular iron sheet = 680m^2

so that length × breadth = 680m^2

given breadth= 4 m

∴ length = 680 / 4 = 170 m .

Given that cost of iron, the sheet used at the rate of Rs 75 per metre.

The total cost of the sheet = Rs. (170 × 75) = Rs. 12750.

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Answer 2

Answer:

500

Step-by-step explanation:

Given that length of the open iron tank = 20 m.

Breadth of the closed iron tank = 10 m

The height of the closed iron tank = 8 m.

Surface Area of the tank = 2[ bh + hl]

= 2[10×8+8×20] = 2×240=480m^2

Area of the rectangular iron sheet = 480m^2

so that length × breadth = 480m^2

But breadth of sheet = 4 m (given)

∴ length = 480 / 4 = 120 m .

Given that cost of iron, the sheet used at the rate of Rs 5 per metre.

The total cost of the sheet = Rs. (120 × 5) = Rs. 600.

The answer is 500