Answer
Please see the work below.
Work Step by Step
We know that
$Volume=\frac{mass}{density}$
$Volume=\frac{154}{13.6}=11.323cm^3$
We can find the density as
$Density=\frac{mass}{Volume}$
$Density=\frac{255}{11.323}=22.5\frac{g}{cm^3}$
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