Kilograms 4994

The janitor is to paint the computer room walls, which are 7 m long, 5 m wide and 3 m high. The classroom has four square windows with a length of 1 m and a door 1 m wide and 2 m high. At least how many kilograms of paint should he buy if 1 kg of paint passes per 15 m2?

Correct answer:

x =  5 kg

Step-by-step explanation:

a=7 m b=5 m c=3 m  S1=c (2 a+2 b)=3 (2 7+2 5)=72 m2 d=1 m S2=4 d2=4 12=4 m2 S3=1 2=2 m2 S=S1S2S3=7242=66 m2 s=15 m2 x=S/s=66/15=5 kg

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