[tex] \frac{2}{25} : \frac{2}{5} + \frac{1}{24} : \frac{1}{12} [/tex]
[tex] \frac{2}{25} * \frac{5}{2} + \frac{1}{24} *12[/tex]
[tex] \frac{1}{25} * 5 + \frac{1}{24} *12[/tex]
[tex] \frac{1}{5} + \frac{1}{24} *12[/tex]
[tex] \frac{1}{5} + \frac{1}{2} = \frac{7}{10} [/tex]