Answer
$R = \frac{PV}{nT}$
Work Step by Step
$Solve$ $the$ $equation$ $for$ $the$ $indicated$ $variable:$
$PV = nRT;$ $for$ $R$
Solve for R
Divide both sides by $nT$
$\frac{PV}{nT} = \frac{nRT}{nT}$
$\frac{PV}{nT} = R$
$R = \frac{PV}{nT}$