Bathroom tile count

The bathroom wall is 4 m long. Its height is half its length. How many square meters of 10 cm x 10 cm square tiles will be needed to cover it?

Final Answer:

A =  8 m²
n =  800

Step-by-step explanation:

$$\begin{gathered} a=4\text{m} \\ b=a/2=4/2=2\text{m} \\ A=a\cdot b=4\cdot 2=8{\text{m}}^2 \end{gathered}$$

$$\begin{gathered} A_2=A\to {\text{cm}}^2=A\cdot 10000{\text{cm}}^2=8\cdot 10000{\text{cm}}^2=80000{\text{cm}}^2 \\ x=10\text{cm} \\ {S}_2=x\cdot x=10\cdot 10=100{\text{cm}}^2 \\ n=A_2/S_2=80000/100=800 \end{gathered}$$

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