Divide:

$15\dfrac{8}{9} ÷ 3\dfrac{2}{3}$

Solving,

$\Rightarrow 15\dfrac{8}{9} ÷ 3\dfrac{2}{3}\\[1em] \Rightarrow \dfrac{143}{9} ÷ \dfrac{11}{3}\\[1em] \Rightarrow \dfrac{143}{9} \times \dfrac{3}{11}\\[1em] \Rightarrow \dfrac{143}{11} \times \dfrac{3}{9} \\[1em] \Rightarrow 13 \times \dfrac{1}{3} \\[1em] \Rightarrow \dfrac{13}{3} \\[1em] \Rightarrow 4\dfrac{1}{3}.$

Hence, $15\dfrac{8}{9} ÷ 3\dfrac{2}{3} = 4\dfrac{1}{3}$