To determine the total number of eighth graders who took the survey, we add the number of eighth graders who prefer pizza to the number who prefer tacos.
From the table:
- Number of 8th graders who prefer Pizza = 54
- Number of 8th graders who prefer Tacos = 81
Total number of 8th graders = 54 + 81 = 135.
So, the answer is 135.