Question

11. A closed box is a cuboid in shape with
length = 40 cm, breadth = 30 cm and
height = 50 cm. It is made of thin metal
sheet. Find the cost of metal sheets required
to make 20 such boxes, if 1 m2 of metal sheet
costs 45.​

Answer 1

Answer:

Length (l)= 40cm= 0.4 m

Breadth(b)= 30cm =0.3m

Height (h)= 50cm =0.5m

Total surface area(S)= l×b+b×h+l×h

S=0.4×0.3+0.3×0.5+0.4×0.5

S=0.12+0.15+0.20

S=0.47m^2

Cost of 1m^2 of metal sheet =45

Cost of 1 cuboid box made of metal sheet (C)=S×45

C=0.47×45=21.15

Cost of 20 cuboid boxes made of metal sheet=C×20=21.15×20=423 rupees

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