I need help with my homework.

Question

In September the total enrollment of school was 1200 students. Of these students 20% of them were boys. A October somewhere boys enrolled in the school and the percent of students that were boys changed to 25%. How many boys enrolled in the school in October

Answer 1

(0.20)(1200) = 240 number of boys to start

x represents the number of boys added

(240 + x) / (1200 + x) = 0.25

Cab you solve for x and answer?