Granite cube

What is the weight in kg granite cube with an edge of 0.5 m if 1dm³ of granite weight 2600 g?

Correct result:

m =  325 kg

Solution:

$$\begin{gathered} a=0.5\text{ m}\to \text{ dm}=0.5\cdot 10\text{ dm}=5\text{ dm } \\ V=a^3=5^3=125{\text{cm}}^3 \\ h=2600\text{ g}\to \text{ kg}=2600\mathrm{/}1000\text{ kg}=2.6\text{ kg } \\ m=h\cdot V=2.6\cdot 125=325\text{ kg} \end{gathered}$$

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