To find the total number of sixth-grade students surveyed, we can add the number of students who chose each subject (Math, English, and Science) for the 6th-grade row in the table.
From the table:
- Number of 6th graders who chose Math: 53
- Number of 6th graders who chose English: 47
- Number of 6th graders who chose Science: 42
Now, let's add these numbers together: 53 + 47 + 42 = 142
Therefore, the total number of sixth-grade students surveyed is 142.