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प्रश्न
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.
उत्तर
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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