Christmas napkins

The girls embroidered Christmas napkins. Each napkin had the shape of a triangle with sides of 5 dm, 60 cm, and 800 mm. How many cms did the girls sew if they made 15 napkins?

Correct answer:

x =  2850 cm

Step-by-step explanation:

$$\begin{gathered} a=5\text{ dm}\to \text{ cm}=5\cdot 10\text{ cm}=50\text{ cm } \\ b=60\text{ cm } \\ c=800\text{ mm}\to \text{ cm}=800\mathrm{/}10\text{ cm}=80\text{ cm } \\ o=a+b+c=50+60+80=190\text{ cm } \\ x=15\cdot o=15\cdot 190=2850\text{ cm} \end{gathered}$$

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