Proportion of first, second and third prizes in calligraphy competition

* * * There are only first, second and third prizes. According to the fact that the first and second prizes account for three-eighths, it can be concluded that the third prize accounts for five-eighths (1-3/8) and the second prize accounts for seven-eighths, that is, a quarter of schools hold calligraphy competitions. The third prizes were 1, 2, 3, and 6544 was won.