Question

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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Answer 1

Answer:

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