23) $726 \left( \frac{nm}{s} \right) = --- \left( \frac{km}{ms} \right)$

24) $47 \times 10^{-7} \left( \frac{Mg}{ns} \right) = --- \left( \frac{ng}{s} \right)$

25) $0.4 \left( \frac{kg.h}{m} \right) = --- \left( \frac{g.s}{cm} \right)$

26) $450 \left( \frac{m}{s^{2}} \right) = --- \left( \frac{mm}{(ns)^{2}} \right)$

27) $13.6 \left( \frac{g}{cm^{3}} \right) = --- \left( \frac{kg}{m^{3}} \right)$

28) $520 \left( \frac{mg.m^{2}}{ns} \right) = --- \left( \frac{g.mm^{2}}{\mu s} \right)$