#### Question

A closed iron tank 12 m long, 9 m wide and 4 m deep is to be made. Determine the cost of iron sheet used at the rate of Rs. 5 per metre sheet, sheet being 2 m wide.

#### Solution

Given length =12,m Breadth = 9m and Height = 4m.

Total surface area of tank`=2(lb+bh+hl)`

`=2[12xx9+9xx4+12xx4]`

`=2[108+36+48]`

`=384m^2`

`"Now length of iron sheet"=(384)/("width of iron sheet" )`

`=384/2=194m.`

Cost of iron sheet = length of sheet xx cost rate

`=192xx5=Rs.960`

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Solution A Closed Iron Tank 12 M Long, 9 M Wide and 4 M Deep is to Be Made. Determine the Cost of Iron Sheet Used at the Rate of Rs. 5 per Metre Sheet, Sheet Being 2 M Wide. Concept: Surface Area of a Cuboid and a Cube.