$\mathrm{Leyla}$ read several books in three days. On the first day he read $\mathrm{<mn>11</mn>}\mathrm{pages}$, on the second day $\mathrm{<mn>9</mn>}\mathrm{pages}$. If the number of pages read on the first day is equal to the sum of the pages read on the second and third day, then it is $\frac{\mathrm{<mn>55</mn>}}{\mathrm{<mn>60</mn>}}$, how many pages did $\mathrm{Leyla}$ read on the third day? 

$\mathrm{Leyla}$ read