Hall

Rectangular hall will have pave by square tiles with a side length 15 cm. The hall has length 18 meters and width 3 m. How many tiles need to buy if 2 percent of the amount is disrupted during the work?

Correct result:

n =  2448

Solution:

$$\begin{gathered} S_1=0.15^2=0.0225 \\ {S}_2=18\cdot 3=54 \\ {S}_3=1.02\cdot S_2=1.02\cdot 54={\displaystyle \frac{1377}{25}}=55.08 \\ {n}_1=S_3\mathrm{/}{S}_1=55.08\mathrm{/}0.0225=2448 \\ n=\lceil n_1\rceil =\lceil 2448\rceil =2448 \end{gathered}$$

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