# Aquarium

I have an aquarium that is 100 cm long and 40 cm wide and 40 cm in height. We fill it with water. How much will it weigh?

Correct result:

m =  160 kg

#### Solution:

$a=100 \ cm \rightarrow dm=100 / 10 \ dm=10 \ dm \ \\ b=40 \ cm \rightarrow dm=40 / 10 \ dm=4 \ dm \ \\ c=40 \ cm \rightarrow dm=40 / 10 \ dm=4 \ dm \ \\ \ \\ V=a \cdot \ b \cdot \ c=10 \cdot \ 4 \cdot \ 4=160 \ \text{dm}^3 \ \\ \ \\ h=1 \ \text{kg/dm}^3 \ \\ \ \\ m=h \cdot \ V=1 \cdot \ 160=160 \ \text{kg}$

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