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 cm

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