Bathroom tile count

How many tiles are needed to cover the bathroom floor, which has the shape of a rectangle measuring 4 m and 25 dm? The tiles are square with dimensions of 10 cm.

Final Answer:

n =  1000

Step-by-step explanation:

$$\begin{gathered} a=4\text{m}\to \text{cm}=4\cdot 100\text{cm}=400\text{cm} \\ b=25\text{dm}\to \text{cm}=25\cdot 10\text{cm}=250\text{cm} \\ d=10\text{cm} \\ {n}_1=a/d=400/10=40 \\ {n}_2=b/d=250/10=25 \\ S=a\cdot b \\ n=n_1\cdot n_2=40\cdot 25=1000 \end{gathered}$$

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