Answer
$2.4\;lb$.
Work Step by Step
Let the required pork is $x$.
Ratio of beef to pork is $6\;lb:x=\frac{6\;lb}{x}$.
And the given ratio of the beef to pork is
$=5:2=\frac{5}{2}$.
Equate both values.
$\Rightarrow \frac{5}{2}=\frac{6\;lb}{x}$
Cross multiply.
$\Rightarrow 5x=12\;lb$
Divide both sides by $12$.
$\Rightarrow x=\frac{12\;lb}{5}$
Simplify.
$\Rightarrow x=2.4\;lb$.