To find out how many students chose Math as their favorite class, we can use the ratio given in the survey. If 3 out of every 5 students said Math is their favorite class, we can represent this as:
\[ \text{Fraction of students who like Math} = \frac{3}{5} \]
Now, to find the expected number of students who prefer Math out of the 200 surveyed, we can multiply the total number of students by the fraction:
\[ \text{Number of students who like Math} = \frac{3}{5} \times 200 \]
Calculating this:
\[ \frac{3}{5} \times 200 = \frac{600}{5} = 120 \]
Thus, we can expect that 120 students chose Math as their favorite class.