Question

Mary want to decorate the Christmas tree . She wants to place the tree on a wooden block covered with coloured paper with picture of Santa Claus on it .she must know the exact quantity of paper to buy for this purpose. the box as length breadth and height as 80 cm and 20 cm respectively . how many square sheet of paper of side 40cm would she require



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Answer 1

Step-by-step explanation:

Since Mary want to paste the paper on the outer surface of the box;the quantity of paper required will be equal to the surface area of the box which is of the shape of a cuboid.

for box , l=80cm

b=40cm

h=20cm

Surface area of box

=2(lb+bh+hl)

=2(80×40+40×20+20×80)

=2(3200+800+1600)

=2(5600)=11200cm^2

now , area of each sheet=40×40=1600cm^2

therefore, required number of sheets

=surface area of box/ area of one sheet

=11200÷1600=7

So, Mary need 7 sheets of paper.

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