Room dimensions

Room dimensions are 5m and 3.5m. The room height is 2.85m. Paint the room (even with the ceiling). There will be two layers. Doors and windows have a total of 2.5 m2. One box of paint is enough for 6m2. How many boxes of paint are needed? How much do we pay if one box costs 5 €?

Correct answer:

n =  22
x =  110 Eur

Step-by-step explanation:

a=5 m b=3.5 m c=2.85 m  W=2.5 m2 K=6 m2 k=2  S=a b+c 2 (a+b)W=5 3.5+2.85 2 (5+3.5)2.5=201269=63209=63.45 m2  n=k S/K=2 63.45/6=22
x=5 n=5 22=110 Eur

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