$r\ =\ \frac{pv}{nt}$

$r\ =\ \frac{pt}{nv}$

$r\ =\ pv\ +\ nt$

$r\ =\ pvnt$

 $r\ =\ 2\Pi+C$  

 $r\ =\frac{C}{2\Pi}$  

 $r\ =\ \frac{2\Pi}{C}$  

 $r\ =\ \left(2\Pi\right)C$  

 $b=\frac{2h}{a}$  

 $b\ =\ \frac{1}{2}Ab$  

 $b\ =\frac{2a}{h}$  

 $b\ =\ \frac{h}{2a}$  

 $g\ =\ \frac{5f}{2h}$  

 $g\ =\ 2\left(5f+h\right)$  

 $g\ =\ \frac{2}{5f+h}$  

 $g\ =\ \frac{5f+h}{2}$  

 $W\ =\ \frac{1000tc}{C}$  

 $W\ =\ \frac{1000C}{tc}$  

 $W\ =\ 1000tc$  

 $W\ =\ \frac{tc}{1000C}$