Question

a closed iron tank 12m long, 9m wide,4m deep is to be made. determine the cost of iron sheet used at the rate of Rs 5 per meter sheet, sheet being 2m wide?

Answer 1

Total surface are of tank = 2(lb + bh + hl ) = 2( 12*9+ 9*4 + 4*12)= 2( 108+36+48) = 192*2 = 384 m^2 = Length of sheet required = area/breadth = 384/2= 192 m Now cost of sheet = 192*5 = 960 rs

Answer 2

Dimenaions of The Iron Tank- 12m×9m×4m

Now, Total Surface Area=2(lb+lh+bh)

2(12×9+12×4+9×4)

2×192

=384 cm^2

Now, as the sheet is 2m wide so,

384÷2=192 cm

Now, as the cost of sheet is Rs.5 per Meter so 192 × 5 = Rs.960