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 answer:

n =  2448

Step-by-step explanation:

$$\begin{gathered} a=15\text{ cm}\to \text{ m}=15\mathrm{/}100\text{ m}=0.15\text{ m } \\ x=18\text{ m } \\ y=3\text{ m } \\ {n}_1=\lceil x\mathrm{/}a\rceil =\lceil 18\mathrm{/}0.15\rceil =120 \\ {n}_2=\lceil y\mathrm{/}a\rceil =\lceil 3\mathrm{/}0.15\rceil =20 \\ {S}_1=n_1\cdot n_2=120\cdot 20=2400 \\ q=2\mathrm{\%}=1+{\displaystyle \frac{2}{100}}=1.02 \\ n=q\cdot S_1=1.02\cdot 2400=2448 \end{gathered}$$

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