Traffic cones

Forty identical traffic cones with a base diameter d = 3 dm and a height v = 6 dm should be painted on the outside with orange paint (without base). How many crowns do we pay for color? If we need 50 cm3 of paint to paint, 1m2 and 1l of paint costs CZK 80?

Correct answer:

x =  46.6312 Kc

Step-by-step explanation:

d=3 dm r=d/2=3/2=23=1.5 dm v=6 dm  s=v2+r2=62+1.526.1847 dm S1=π r s=3.1416 1.5 6.184729.1445 dm2 S2=1 m2 dm2=1 100  dm2=100 dm2  n=40 1 l=1 dm3 c=80 kc/dm3 V1=50 cm3 dm3=50:1000  dm3=0.05 dm3  k=c V1/S2=80 0.05/100=251=0.04 Kc/dm2  x=n S1 k=40 29.1445 0.04=46.6312 Kc

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