 a) \\  \\ \dfrac{125}{150}  \\  \\ \\ \ \dfrac{125}{150} \ \dfrac{\div}{\div} \dfrac{5}{5} = \dfrac{25}{30} \\  \\  \\ \dfrac{25}{30} \ \dfrac{\div}{\div} \dfrac{5}{5} = \dfrac{5}{6}