According to Universities Australia (using data supplied by DEST), student-teacher ratios at Australian universities have risen from 13-14 in 1990 to over 20 by 2005; net numbers of staff have grown slowly over this period, but not nearly as fast as student enrolments. (Some related data by Universities Australia can also be found at this page.) For comparison, international averages of such ratios are about 16-17 (see page 16 of this report; in the University of California system, the ratios are about 17-18. There may be differences in methodology across countries, though, that make it difficult to make exact comparisons).
At USQ, with approximately 16 FTE (full time equivalent) staff teaching mathematics and statistics, and 440 EFTSL (equivalent full time student loads) being taught (mostly in service courses), the student-teacher ratio is approximately 28. With five staff cuts in these divisions still planned (and the two new positions being non-teaching in nature), this ratio will almost certainly increase.