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An iron tank 20 m long …

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

Posted by Sundram Jha 5 years ago

CBSE > Class 08 > Mathematics

1 answers

Gaurav Seth 5 years ago

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.

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