First, we have to find the highest common factor, and that involves a bit of guess and check - I personally started with the highest factors from 56 and worked my way from there, finding 8. If there were 8 people per column, there would be 12 columns for the high school (96/8) and 7 for the middle school (56/8). If there were 8 columns each, you'd switch the numbers around so there would be 12 people per column for the high school and 7 for the middle school