Question

If a square wall of side $40m$ has to be covered with shahabad stones of size $250cm\times 100cm,$then,

How many stones will be needed?

Answer 1

The side of the square $=40m$

Area of the square $=Side\times Side$

$$\begin{gathered} =40\times 40 \\ =1600 \end{gathered}$$

So, the area of the Rectangle is $1600m^2=1600\times 10000=16000000c{m}^2$

Then we need to find the area of stones

Area of Stone $=length\times breadth$

$$\begin{gathered} =250\times 100 \\ =25000 \end{gathered}$$

So, the Area of stone is $25000c{m}^2$

Then the number of stone $=\frac{AreaofRec\tan gle}{Areaoftiles}$

$$\begin{gathered} =\frac{16000000}{25000} \\ =640 \end{gathered}$$

Hence, the number of stone is $640$.