Question

If the box has length, breadth and height as 80cm,40cm and20cm. How many square sheets of paper of side 40cm would required to cover the box

Answer 1

volume of the box=80x40x20=64000cm cube
area of paper=40x40=1600
papers required=64000÷1600=40

ans 40 papers

Answer 2

$\Large{\textbf{\underline{\underline{According\:to\:the\:Question}}}}$

Length = 80 cm

Breadth = 40 cm

Height = 20 cm

$\textbf{\underline{Surface\;are\;of\;Box}}$

= 2(L × B + B × H + H × L)

= 2(80 × 40 + 40 × 20 + 20 × 80)

= 2(3200 + 800 + 1600)

= 2 × 5600

= 11200 sq cm

Hence,

Side = 40 cm

$\textbf{\underline{Area\;of\;Square}}$

= Side × Side

= 40 × 40

= 1600

$\textbf{\underline{Area\;of\;1\;square}}$

= 1600 sq cm

Situation :-

$\tt{\rightarrow\dfrac{Surface\;area\;of\;box}{Area\; of\;1\;square}}$

$\tt{\rightarrow\dfrac{11200}{1600}}$

= 7

Hence,

$\Large{\boxed{\sf\:{Seven\;Square\;sheet\;is\;Needed}}}$