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 result:

x =  2850 cm

Solution:

a=5 dm→cm=5⋅ 10 cm=50 cm b=60 cm c=800 mm→cm=800/10 cm=80 cm  o=a+b+c=50+60+80=190 cm  x=15⋅ o=15⋅ 190=2850 cma=5 \ dm \rightarrow cm=5 \cdot \ 10 \ cm=50 \ cm \ \\ b=60 \ \text{cm} \ \\ c=800 \ mm \rightarrow cm=800 / 10 \ cm=80 \ cm \ \\ \ \\ o=a+b+c=50+60+80=190 \ \text{cm} \ \\ \ \\ x=15 \cdot \ o=15 \cdot \ 190=2850 \ \text{cm}

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