[tex]three=3\\\\seven\ eighths=\dfrac{7}{8}\\\\3\dfrac{7}{8}=\dfrac{3\cdot8+7}{8}=\dfrac{24+7}{8}=\dfrac{31}{8}\\\\Answer:\ \boxed{\dfrac{31}{8},\ 3\dfrac{7}{8}}[/tex]
