Question

Ajay has built a cubical water tank in his house. The top of the water tank is covered with lid. he wants to cover the inner surface of the tank including the lid with square tiles of side 25 cm. If each inner edge of the water tank is 2 m long and tiles costs rs. 360 per dozen. then find the total amount required for tiles.

Answer 1

Dear student,

$$\begin{gathered} Giventhat, \\ Inneredgeofthecubical\tan k\left(a\right)=2m=200cm \\ Thetopiscoveredwithalidandsoitbecomesaclosedsolid \\ Totalsurfacearea=6\times a\times a \\ =6\times 200\times 200 \\ =240000 \\ Theinnersurfaceofthe\tan kincludingthelidistobecoveredwithtilesofedge=25cm \\ Numberoftilesrequired=\frac{Totalsurfacearea}{Areaofeachtile} \\ =\frac{240000}{25\times 25} \\ =384 \\ Costoftiles=Rs360perdozen \\ Numberofdozens=\frac{384}{12}=32 \\ Therefore,totalamountrequiredfortiles=360\times 32=Rs11520 \end{gathered}$$

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