Cross-section 81879

The castle has a length of 4 m and a cross-section in the shape of a square whose side is 15 cm long. Eight such castles must be painted. One kilogram can is enough for 6 m2 of coating. How many cans of paint should be bought?

Correct answer:

n =  4

Step-by-step explanation:

l=4 m a=15 cm m=15:100  m=0.15 m S1=6 m2  S2=l 4 a+2 a2=4 4 0.15+2 0.152=200489=220089=2.445 m2 S8=8 S2=8 2.445=25489=192514=19.56 m2  n1=S8/S1=19.56/6=50163=35013=3.26  n=n1=3.26=4

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