# Mary wants to decorate her Christmea tree. She wants to place the tree on a wooden block covered with coloured paper with picture of Sants Claus on it. She must know the exact quantity of paper to buy for this purpose. If the box has length, breadth and height as 80 cm, 40 cm and 20 cm respectively. How many square sheets of paper of side 40 cm would she require?

Given,

Dimensions of box = 80cm ×40cm×20cm

So,

quantity of paper required by Mary to cover the wooden block is total surface area = 2(80×40+40×20+20×80)

= 11200 cm2

Hence,

number of square sheet of side 40 cm required =

=

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