First find how many chairs Jackson needs for the four-seat tables by multiplying the number of four-seat tables by 4: 4 chairs/table * 6 tables = <<4*6=24>>24 chairs
Next find how many chairs Jackson needs for the six-seat tables by multiplying the number of six-seat tables by 6: 6 chairs/table * 12 tables = <<6*12=72>>72 chairs
Now add the number of chairs for the four- and six-seat tables to find the total number of chairs Jackson needs: 24 chairs + 72 chairs = <<24+72=96>>96 chairs
#### 96