Dimensions 16813

Calculate how many bricks we will need to build a room that should be 1.8 m wide, 2 m long, and 2.4 m high. The dimensions of the brick are 25 cm x 60 cm.

Correct answer:

n =  122

Step-by-step explanation:

$$\begin{gathered} a=1.8\text{m} \\ b=2\text{m} \\ c=2.4\text{m} \\ S=2\cdot (a+b)\cdot c=2\cdot (1.8+2)\cdot 2.4=\frac{456}{25}=18\frac{6}{25}=18.24{\text{m}}^2 \\ x=25\text{cm}\to \text{m}=25:100\text{m}=0.25\text{m} \\ y=60\text{cm}\to \text{m}=60:100\text{m}=0.6\text{m} \\ {S}_1=x\cdot y=0.25\cdot 0.6=\frac{3}{20}=0.15{\text{m}}^2 \\ n=S/S_1=18.24/0.15=122 \end{gathered}$$

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