Resposta:
[tex](\dfrac{6+10}{15})\times(\dfrac{5}{8}\times\dfrac{3}{7})=\\ \\ \\ \dfrac{16}{\not15}\times\dfrac{\not15}{56}=\\ \\ \\ \dfrac{16}{56}=\dfrac{16:8}{56:8}=\boxed{\dfrac{2}{7}}[/tex]
