Empty aquarium

How much does an empty aquarium weigh with dimensions: length = 40 cm, width = 30 cm, height = 20 cm, if 1 dm2 of glass weighs 300 g? Calculate its weight in kilograms.

Correct answer:

m =  12 kg

Step-by-step explanation:

a=40 cm dm=40:10  dm=4 dm b=30 cm dm=30:10  dm=3 dm c=20 cm dm=20:10  dm=2 dm  ρ=300 g/dm2 S=a b+2 (a+b) c=4 3+2 (4+3) 2=40 dm2  m1=S ρ=40 300=12000 g  m=m1 kg=m1:1000  kg=12000:1000  kg=12 kg=12 kg

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