A closed cuboidal iron water tank is 12m long, 9m wide and 4m high is to be made from an iron sheet of breadth 2m .find the cost of iron sheet at the rate of rupees 45 per metre.
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Total Surface Area of the tank = 2[lb + bh + hl]
= 2[12×9+9×4+4×12]
= 384 m2
Area of the rectangular iron sheet = 384 m2
so that length × breadth = 384 m2
But breadth of sheet = 2 m (given)
∴ length = 384 / 2 = 192 m .
Given that cost of iron sheet used at the rate of Rs 45 per metre.
Total cost of the sheet = Rs. (192 × 45)
= Rs. 8640.
= 2[12×9+9×4+4×12]
= 384 m2
Area of the rectangular iron sheet = 384 m2
so that length × breadth = 384 m2
But breadth of sheet = 2 m (given)
∴ length = 384 / 2 = 192 m .
Given that cost of iron sheet used at the rate of Rs 45 per metre.
Total cost of the sheet = Rs. (192 × 45)
= Rs. 8640.
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