Question

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

Answer 1

SOLUTION:-

Given:

•Length of closed iron=12m

•Breadth of closed iron= 9m

•Height of closed iron= 4m

A/q

Using the formula of the total surface area of the cuboid;

=)2(lb +bh+lh)

=) 2(12×9+9×4+12×4)

=) 2(108 + 36 + 48)

=) 2(192)

=) 384m²

Area of the rectangular iron sheet=384cm²

Therefore,

L× B= 384cm²

L ×2m = 284cm²

L= 384/2

L= 192m [Sheet 2m wide]

Now,

The cost of iron sheet is Rs.5m²

Total cost of iron sheet;

=) Rs.(192 ×5)

=) Rs.960

Thank you.

Answer 2

SOLUTION:-

Given:

•Length of closed iron=12m

•Breadth of closed iron= 9m

•Height of closed iron= 4m

A/q

Using the formula of the total surface area of the cuboid;

=)2(lb +bh+lh)

=) 2(12×9+9×4+12×4)

=) 2(108 + 36 + 48)

=) 2(192)

=) 384m²

Area of the rectangular iron sheet=384cm²

Therefore,

L× B= 384cm²

L ×2m = 284cm²

L= 384/2

L= 192m [Sheet 2m wide]

Now,

The cost of iron sheet is Rs.5m²

Total cost of iron sheet

=) Rs.(192 ×5)

=) Rs.960

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