Question

a tank 30 M long 20 m wide and 4.5 feet deep is to be made it is open from the top find the cost of iron sheet required at the rate of Rs 65 per metre square to make the tank

Answer 1

Answer

Given that  length of the closed iron tank = 12 m.

Breadth of the closed iron tank = 9 m

The height of the closed iron tank = 4 m.

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

= 2[12×9+9×4+4×12] = 384  m^{2}

Area of the rectangular iron sheet = 384  m^{2}

so that  length × breadth = 384  m^{2}

But breadth of sheet = 2 m (given)

∴  length = 384 / 2 = 192 m .

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

The total cost of the sheet = Rs. (192 × 5) = Rs. 960.

Hope I helped you! :)

Answer 2

HEY Buddy.....!! here is ur answer

Given that.... length = 30m, Width = 20m, and
Height = 4.5m

Now, Curved surface area of = 2h(l+b)

=> 2×4.5(30+20)

=> 9×50

=>450 m²

Also given that , Cost of iron sheet at per m² = Rs 65

So, the total cost of iron sheet required = 65×450 = 29,250 Rs.

I hope it will be helpful for you...!!

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