To find the total number of eighth graders who took the survey, we need to add the number of eighth graders who preferred pizza to those who preferred tacos.
According to the table:
- Eighth graders who preferred pizza: 54
- Eighth graders who preferred tacos: 81
Now, we add these two numbers together: 54 + 81 = 135
So, the total number of eighth graders who took the survey is 135.