Question

mary wants to decorate her christmas tree . she wants to place the tree on a wooden box covered with coloured paper with picture of santa 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 80cm , 40cm and 20cm respectively how many square sheets of paper of side 40 cm would she require ?

Answer 1

may this helps you...

Answer 2

Solution :-

• Length = 80cm

• Breadth = 40 cm

• Height = 20 cm

Surface area of box = 2(lb + bh + hl )

⠀⠀= 2[(80×40)+(40×20)+(20×80)] ${cm}^{2}$

⠀⠀= 2[3200+800+1600] ${cm}^{2}$

⠀⠀⠀= 2×5600 ${cm}^{2}$

⠀⠀⠀= 11200 ${cm}^{2}$

Area of each sheet of the paper

⠀⠀⠀⠀⠀=⠀40× 40 ${cm}^{2}$

⠀⠀⠀⠀⠀⠀= 1600 ${cm}^{2}$

⠀∴ number of sheet required

⠀⠀⠀⠀⠀⠀⠀=⠀ $\dfrac{surface\: area}{area\:of\:one\:sheet}$

⠀⠀⠀⠀⠀⠀⠀= $\dfrac{11200}{1600}$

⠀⠀⠀⠀⠀= 7

⠀⠀⠀⠀So , she would require 7 sheet's