Question

the length, breadth and height of the rectangular box are 80cm, 40cm and 20cm respectively, if the square paper of 40cm length is to be glued on it, how many such papers are required?
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Answer 1

Answer:

The required answer is $7.$

Step-by-step explanation:

Given: The square paper must be pasted to the rectangle box, which has dimensions of $80$ cm long, $40$ cm wide, and $20$ cm high.

Length $(\mathrm{l})=80 \mathrm{~cm}$

Breath $(\mathrm{b})=40 \mathrm{~cm}$ and height $(\mathrm{h}) =20 \mathrm{~cm}$

The surface area of rectangular box $=2[\mid \mathrm{b}+\mathrm{bh}+\mathrm{hl}]$

$=2[80(40)+40(20)+20(80)]$

$2(5600)=11,200 \mathrm{~cm}^{2}$

Each sheet of paper's surface area$=40 \times 40 \mathrm{~cm}^{2}$

$=1600 \mathrm{~cm}^{2}$

Therefore,

Number of sheets required $=$ $\frac{\text { surface areaa of box }}{\text { area of one sheet of paper }}$

$=\frac{11,200}{1600}=7$

Hence, the papers are required= $7$

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