Final answer:
To determine the total number of students who participated in the survey, you need the exact value of 'x' or more information.
Step-by-step explanation:
In the survey, 30% of the students chose Math as their favorite subject, while 45% chose English. Additionally, 20 students chose "other" subjects. To determine the total number of students who participated, we need to calculate the number of students represented by each percentage.
Let's say 'x' represents the total number of students. The number of students who chose Math is 30% of 'x', which is 0.3x. Similarly, the number of students who chose English is 45% of 'x', which is 0.45x. Adding the number of students who chose other subjects, we have:
Total participants = number of Math students + number of English students + number of students who chose other subjects
Total participants = 0.3x + 0.45x + 20
Since we don't have the exact value of 'x', we can't calculate the total number of participants without more information.