An iron tank 20 m long, 10 m wide and 8 m deep is to be made from iron

1.	An iron tank 20 m long, 10 m wide and 8 m deep is to be made from iron sheet 4 m wide. Iittank is open from the top, find the cost of the iron sheet at the rate or 5 per metre.
Answer» Given that length of theopen 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^2so 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.

An iron tank 20 m long, 10 m wide and 8 m deep is to be made from iron sheet 4 m wide. Iittank is open from the top, find the cost of the iron sheet at the rate or 5 per metre.

Answer»

Given that length of theopen 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^2so 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.