A box made of sheet metal costs rupees 2920 at the rate of rupees 30 per square meter. If the box is 5 m long, 4 m wide, find its length.
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Total cost=2820
Rate of cost-30/m^2
length of box=5m
breadth of box=4m
Area of metal sheet-2(lb+bh+lh)
2(5x4+4h+5h)
2(20+9h)
=40+18h
cost of sheet=area of sheet xcost for 1m^2 of
sheet
2820=(40+18h)*30
94-40+18h
18h-54
h=3
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